Appendix:FireRed and LeafGreen walkthrough/Section 17

After exploring the rest of the Sevii Islands, there's only one area left to investigate - Cerulean Cave. To reach it, stop back in Cerulean and surf south from the bridge. The cave entrance is located on the western shoreline. The requirements for entering the cave other than defeating the Elite Four the first time is to complete the mission on the Sevii Islands that opens the connection to the other Generation III games.

Cerulean Cave

This is a treacherous cave, with not only powerful Pokémon, but a wide variety of species as well. Stock up on Ultra Balls and bring your Super Rod along. Make sure to bring along a team with Surf and Rock Smash, and withdraw that Master Ball from the PC. Mewtwo is one tough fighter, and even harder to catch than the legendary birds, so if you used it already, you're in for a long battle.

1F

Cerulean Cave, 1F

From the entrance, walk to the water's edge and surf north to the small island in the northeast corner. Take the stairs here to reach the second floor, and a Full Restore lying behind a few breakable boulders. Return to the first floor.

Surf west across the pond, and climb out of the water onto the northern steps. Pick up the Nugget, and take the stairs south of here to the second floor, where you'll find a PP Up behind another breakable boulder. Return to the first floor again.

Walk south off of the rock ledge, and grab the Full Restore near the group of breakable boulders. Step up onto the rock ledge to the east, and take the first stairs you see to the second floor yet again. Smash the boulder and pick up the Ultra Ball, and take the stairs back to the first floor.

Grab the Max Elixir to the northwest, and follow the rock ledge counter-clockwise to reach the stairs in the center. Take these stairs to the second floor.

Available Pokémon

Pokémon Games Location Levels Rate Parasect FR LG Cave 49-58 25% Magneton FR LG Cave 49 20% Golbat FR LG Cave 46-55 14% Primeape FR LG Cave 52-61 11% Ditto FR LG Cave 52-61 11% Machoke FR LG Cave 46 10% Electrode FR LG Cave 58 5% Wobbuffet FR LG Cave 55 4% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% Surfing and Fishing Psyduck FR LG Surfing 30-50 65% Slowpoke FR LG Surfing 30-50 65% Golduck FR LG Surfing 40-55 35% Slowbro FR LG Surfing 40-55 35% Magikarp FR LG Fishing Old Rod 5 100% Poliwag FR LG Fishing Good Rod 5-15 60% Goldeen FR LG Fishing Good Rod 5-15 20% Magikarp FR LG Fishing Good Rod 5-15 20% Poliwag FR LG Fishing Super Rod 15-25 40% Poliwhirl FR LG Fishing Super Rod 20-30 40% Gyarados FR LG Fishing Super Rod 15-25 15% Psyduck FR LG Fishing Super Rod 15-35 5% Slowpoke FR LG Fishing Super Rod 15-35 5% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Items
Item Location Games

2F

Cerulean Cave, 2F

There are three different paths branching out from these stairs, but the only one that leads anywhere runs counter-clockwise through the center of the floor to the stairs in the northwest corner.

This area is a small, isolated area in the northwest of the first floor. Take the only other stairs down to the basement floor.

Available Pokémon

Pokémon Games Location Levels Rate Golbat FR LG Cave 49-58 25% Machoke FR LG Cave 49 20% Parasect FR LG Cave 52-61 14% Kadabra FR LG Cave 55-64 11% Ditto FR LG Cave 55-64 11% Magneton FR LG Cave 52 10% Wobbuffet FR LG Cave 58 5% Electrode FR LG Cave 61 4% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Items
Item Location Games

B1F

Cerulean Cave, B1F

Follow the pathway to the east. In the northeast, near a group of breakable boulders, is a Max Revive. Follow the path south, and step up onto the central rock ledge. Grab the nearby Ultra Ball, and continue west to the water's edge.
Surf to the northwest to reach the tiny, isolated island where Mewtwo waits.

Available Pokémon

Pokémon Games Location Levels Rate Kadabra FR LG Cave 58-67 25% Ditto FR LG Cave 58-67 25% Parasect FR LG Cave 55-64 14% Golbat FR LG Cave 52-61 11% Machoke FR LG Cave 52 10% Magneton FR LG Cave 55 10% Electrode FR LG Cave 64 4% Wobbuffet FR LG Cave 61 1% Geodude FR LG Rock Smash 30-50 65% Graveler FR LG Rock Smash 40-55 35% Surfing and Fishing Psyduck FR LG Surfing 30-50 65% Slowpoke FR LG Surfing 30-50 65% Golduck FR LG Surfing 40-55 35% Slowbro FR LG Surfing 40-55 35% Magikarp FR LG Fishing Old Rod 5 100% Poliwag FR LG Fishing Good Rod 5-15 60% Goldeen FR LG Fishing Good Rod 5-15 20% Magikarp FR LG Fishing Good Rod 5-15 20% Poliwag FR LG Fishing Super Rod 15-25 40% Poliwhirl FR LG Fishing Super Rod 20-30 40% Gyarados FR LG Fishing Super Rod 15-25 15% Psyduck FR LG Fishing Super Rod 15-35 5% Slowpoke FR LG Fishing Super Rod 15-35 5% Special Pokémon Mewtwo FR LG Only one 70 Only one A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. Types: Psychic Unknown Ability: Pressure Held item: None Mewtwo Lv.70 Swift Normal   --       Recover Normal   --       Safeguard Normal   --       Psychic Psychic   --

Items
Item Location Games

Mewtwo

The master of Cerulean Cave

Not only is it the strongest Pokémon in the game, but when you find it, it's already at level 70. If you don't have the Master Ball, this is going to be even tougher than catching the legendary birds. Like with any legendary, SAVE THE GAME before approaching it; with only one shot, you do not want to mess this up. If you do have the Master Ball, than all you have to do is throw it right away, don't even bother battling with it. Most damage you inflict will probably be healed right away, since it can use Recover 10 times. Its few weaknesses include attacks from the Bug-, Ghost-, and Dark-types, so moves like Shadow Ball and Bite will have the greatest effect. You may want to dispatch the legendary birds against him, since Mewtwo is the only thing stronger than them. Without the Master Ball, try inflicting status problems that prevent it from recovering its health, like Sleep or Freeze.

Once the battle's done, use an Escape Rope (or Dig) to exit the cave. You have now passed every challenge in the game, though you may still have holes in your Pokédex data. With every area explored, all that's left is to complete the Pokédex for Professor Oak. If you manage to do it, remember to show it to the Game Freak employees in Celadon for your reward.

Elite Four rematch

Another benefit for completing the mission in the Sevii Islands to connect the link system to Hoenn is that Lorelei will return to the Indigo Plateau. If you challenge the Elite Four again you'll find that their team has been strengthened and a few of their Pokémon had been replaced with Johto region Pokémon.

Lorelei

Elite Four Lorelei Indigo Plateau FireRed and LeafGreen Elite Four and Professor Lorelei Oak Indigo Plateau FireRed and LeafGreen Reward: $6600

Types: Water Ice Ability: Thick Fat Held item: None Dewgong♂ Lv.64 Surf Water   --       Ice Beam Ice   --       Signal Beam Bug   --       Double Team Normal   --       Types: Water Ice Ability: Shell Armor Held item: None Cloyster♂ Lv.63 Rain Dance Water   --       Surf Water   --       Ice Beam Ice   --       Supersonic Normal   --       Types: Ice Ground Ability: Oblivious Held item: None Piloswine♂ Lv.63 Earthquake Ground   --       Blizzard Ice   --       Double-Edge Normal   --       Rock Slide Rock   --       Types: Ice Psychic Ability: Oblivious Held item: None Jynx♀ Lv.66 Psychic Psychic   --       Ice Beam Ice   --       Lovely Kiss Normal   --       Attract Normal   --       Types: Water Ice Ability: No Ability Held item: Cheri Berry Lapras♂ Lv.66 Psychic Psychic   --       Thunder Electric   --       Surf Water   --       Ice Beam Ice   --

Her Slowbro has been replaced with Piloswine. Her Lapras now has Thunder and Dewgong now has Signal Beam. Other than that her team is not that much different. A Fighting or Electric-type-type would be able to handle her team. If you use a Fire-type against Piloswine, finish it off quickly as it knows two moves that could KO one quickly especially Charizard.

Bruno

Elite Four Bruno Indigo Plateau FireRed and LeafGreen Elite Four and Professor Bruno Oak Indigo Plateau FireRed and LeafGreen Reward: $6800

Types: Steel Ground Ability: Sturdy Held item: None Steelix♂ Lv.65 Earthquake Ground   --       Rock Tomb Rock   --       Iron Tail Steel   --       Crunch Dark   --       Types: Fighting Unknown Ability: Keen Eye Held item: None Hitmonchan♂ Lv.65 Sky Uppercut Fighting   --       Mach Punch Fighting   --       Rock Slide Rock   --       Counter Fighting   --       Types: Fighting Unknown Ability: Limber Held item: None Hitmonlee♂ Lv.65 Mega Kick Normal   --       Foresight Normal   --       Earthquake Ground   --       Rock Slide Rock   --       Types: Steel Ground Ability: Sturdy Held item: None Steelix♂ Lv.66 DragonBreath Dragon   --       Iron Tail Steel   --       Earthquake Ground   --       Crunch Dark   --       Types: Fighting Unknown Ability: Guts Held item: Persim Berry Machamp♂ Lv.68 Brick Break Fighting   --       Cross Chop Fighting   --       Earthquake Ground   --       Rock Slide Rock   --

Both Bruno's Onix have evolved into Steelix. With their weak Sp. Defense a powerful Fire-type attack can easily KO them. His other Pokémon now know how to use Rock Slide so be careful if you use a Flying-type. The Psychic-type will still dominate Bruno, as the only moves that are super-effective on them are the Steelix's Crunch. Bring in a team with a strong slate of Special Attackers and the fight will be easy.

Agatha

Elite Four Agatha Indigo Plateau FireRed and LeafGreen Elite Four and Professor Agatha Oak Indigo Plateau FireRed and LeafGreen Reward: $7000

Types: Ghost Poison Ability: Levitate Held item: None Gengar♂ Lv.66 Confuse Ray Ghost   --       Shadow Punch Ghost   --       Hypnosis Psychic   --       Psychic Psychic   --       Types: Poison Flying Ability: Inner Focus Held item: None Crobat♂ Lv.66 Confuse Ray Ghost   --       Shadow Ball Ghost   --       Air Cutter Flying   --       Sludge Bomb Poison   --       Types: Ghost Unknown Ability: Levitate Held item: None Misdreavus♂ Lv.65 Shadow Ball Ghost   --       Thunderbolt Electric   --       Psychic Psychic   --       Attract Normal   --       Types: Poison Unknown Ability: Intimidate Held item: None Arbok♂ Lv.68 Double Team Normal   --       Sludge Bomb Poison   --       Earthquake Ground   --       Giga Drain Grass   --       Types: Ghost Poison Ability: Levitate Held item: Chesto Berry Gengar♂ Lv.70 Shadow Ball Ghost   --       Sludge Bomb Poison   --       Psychic Psychic   --       Thunderbolt Electric   --

Her Golbat has evolved into Crobat and her Haunter has been replaced with Misdreavus. Other than that Arbok now knows how to use Earthquake, both Gengar knows how to use Psychic and one of her Gengar as well as Misdreavus knowing how to use Thunderbolt. If you choose to use a Pokémon that is or knows a move from the Psychic or Dark-type, choose carefully as Agatha's Pokémon have moves to counter different types, making it difficult for Pokémon such as Murkrow to win. All of Agatha's Pokémon have relatively poor Defenses, and all except for Misdreavus are weak to Psychic-type attacks.

Lance

Elite Four Lance Indigo Plateau FireRed and LeafGreen Elite Four and Professor Lance Oak Indigo Plateau FireRed and LeafGreen Reward: $7200

Types: Water Flying Ability: Intimidate Held item: None Gyarados♂ Lv.68 Dragon Dance Dragon   --       Earthquake Ground   --       Thunder Wave Electric   --       Hyper Beam Normal   --       Types: Dragon Flying Ability: Inner Focus Held item: None Dragonite♂ Lv.66 Flamethrower Fire   --       Dragon Claw Dragon   --       Earthquake Ground   --       Hyper Beam Normal   --       Types: Water Dragon Ability: Swift Swim Held item: None Kingdra♂ Lv.66 Dragon Dance Dragon   --       Surf Water   --       Ice Beam Ice   --       Hyper Beam Normal   --       Types: Rock Flying Ability: Pressure Held item: None Aerodactyl♂ Lv.70 Aerial Ace Flying   --       AncientPower Rock   --       Earthquake Ground   --       Hyper Beam Normal   --       Types: Dragon Flying Ability: Inner Focus Held item: Persim Berry Dragonite♂ Lv.72 Thunderbolt Electric   --       Outrage Dragon   --       Ice Beam Ice   --       Hyper Beam Normal   --

Lance is more difficult to face than before. He now has two Dragonite and one of his Dragonair has been replaced by Kingdra. Facing Kingdra will be difficult since only Dragon-type moves will do super effective damage against it and it is capable of countering the Dragon-type as well as the Grass-type. A powerful Electric-type or Ice-type move will suffice, or a Dragon-type move if possible. Both Dragonites have moves to counter pure Ice-types or ones that are part Water types. It is possible to make it easier if a paralyzing move like Thunder Wave is used to cut their speed. Lastly both Gyarados and Aerodactyl now have moves that can counter the types they are weak to. Lapras is a good Pokémon to bring to this fight, as it can learn both Ice and Electric-type moves, while resisting Fire and Ground-type moves.

Blue

If the player chose Bulbasaur:	If the player chose Charmander:	If the player chose Squirtle:
Champion Blue Indigo Plateau FireRed and LeafGreen Champion and Professor Blue Oak Indigo Plateau FireRed and LeafGreen Reward: $7500 Types: Bug Fighting Ability: Unknown Held item: None Heracross♂ Lv.72 Megahorn Bug   --       Counter Fighting   --       Rock Tomb Rock   --       Earthquake Ground   --       Types: Psychic Unknown Ability: Synchronize Held item: None Alakazam♂ Lv.73 Psychic Psychic   --       Reflect Psychic   --       Calm Mind Psychic   --       Shadow Ball Ghost   --       Types: Rock Dark Ability: Sand Stream Held item: None Tyranitar♂ Lv.72 Crunch Dark   --       Thunderbolt Electric   --       Earthquake Ground   --       Aerial Ace Flying   --       Types: Water Flying Ability: Intimidate Held item: None Gyarados♂ Lv.73 Dragon Dance Dragon   --       Hydro Pump Water   --       Earthquake Ground   --       Hyper Beam Normal   --       Types: Grass Psychic Ability: Chlorophyll Held item: None Exeggutor♂ Lv.73 Sleep Powder Grass   --       Light Screen Psychic   --       Giga Drain Grass   --       Psychic Psychic   --       Types: Fire Flying Ability: Blaze Held item: Sitrus Berry Charizard♂ Lv.75 Fire Blast Fire   --       Aerial Ace Flying   --       Dragon Claw Dragon   --       Earthquake Ground   --	Champion Blue Indigo Plateau FireRed and LeafGreen Champion and Professor Blue Oak Indigo Plateau FireRed and LeafGreen Reward: $7500 Types: Bug Fighting Ability: Unknown Held item: None Heracross♂ Lv.72 Megahorn Bug   --       Counter Fighting   --       Rock Tomb Rock   --       Earthquake Ground   --       Types: Psychic Unknown Ability: Synchronize Held item: None Alakazam♂ Lv.73 Psychic Psychic   --       Reflect Psychic   --       Calm Mind Psychic   --       Shadow Ball Ghost   --       Types: Rock Dark Ability: Sand Stream Held item: None Tyranitar♂ Lv.72 Crunch Dark   --       Thunderbolt Electric   --       Earthquake Ground   --       Aerial Ace Flying   --       Types: Grass Psychic Ability: Chlorophyll Held item: None Exeggutor♂ Lv.73 Sleep Powder Grass   --       Light Screen Psychic   --       Giga Drain Grass   --       Psychic Psychic   --       Types: Fire Unknown Ability: Intimidate Held item: None Arcanine♂ Lv.73 Overheat Fire   --       ExtremeSpeed Normal   --       Iron Tail Steel   --       Aerial Ace Flying   --       Types: Water Unknown Ability: Torrent Held item: Sitrus Berry Blastoise♂ Lv.75 Rain Dance Water   --       Hydro Pump Water   --       Ice Beam Ice   --       Earthquake Ground   --	Champion Blue Indigo Plateau FireRed and LeafGreen Champion and Professor Blue Oak Indigo Plateau FireRed and LeafGreen Reward: $7500 Types: Bug Fighting Ability: Unknown Held item: None Heracross♂ Lv.72 Megahorn Bug   --       Counter Fighting   --       Rock Tomb Rock   --       Earthquake Ground   --       Types: Psychic Unknown Ability: Synchronize Held item: None Alakazam♂ Lv.73 Psychic Psychic   --       Reflect Psychic   --       Calm Mind Psychic   --       Shadow Ball Ghost   --       Types: Rock Dark Ability: Sand Stream Held item: None Tyranitar♂ Lv.72 Crunch Dark   --       Thunderbolt Electric   --       Earthquake Ground   --       Aerial Ace Flying   --       Types: Fire Unknown Ability: Intimidate Held item: None Arcanine♂ Lv.73 Overheat Fire   --       ExtremeSpeed Normal   --       Iron Tail Steel   --       Aerial Ace Flying   --       Types: Water Flying Ability: Intimidate Held item: None Gyarados♂ Lv.73 Dragon Dance Dragon   --       Hydro Pump Water   --       Earthquake Ground   --       Hyper Beam Normal   --       Types: Grass Poison Ability: Overgrow Held item: Sitrus Berry Venusaur♂ Lv.75 Sunny Day Fire   --       SolarBeam Grass   --       Sludge Bomb Poison   --       Earthquake Ground   --

The main change to Blue's team is that his Pidgeot and Rhydon have been replaced by Heracross and Tyranitar. They along with Alakazam and the rest of his team depending on what your starter was have new movesets that can also counter most types they are weak to aside from Arcanine and Exeggutor.

Although Blue's new team is very powerful, it has some major weaknesses that can be exploited by a skilled trainer. Any Flying-type move should be able to quickly defeat Heracross, as it is 4× super effective. Tyranitar also has a 4× weakness to the Fighting-type, so be sure to take it out as quickly as possible before it is able to inflict heavy damage with its extremely high Attack stat. Exeggutor also has a quadruple weakness to the Bug-type, so any Pokémon can learn a Bug-type move like Signal Beam (for example: Dewgong will be able to wipe it out). Alakazam is also weak to the Bug-type as well as the Dark-type and the Ghost-type, and its terrible Defense can be exploited. Beware of its extremely high Special Attack stat, however. Gyarados is very difficult to deal with, as it has Intimidate, good Defense, Special Defense, Speed, and very high Attack. It has a quadruple weakness to the Electric-type, but its Earthquake can quickly destroy any Electric-type Pokémon that it outspeeds. Arcanine is powerful and fast, but it cannot counter any Water, Ground, or Rock-type Pokémon. His starter is the most difficult: all three of his starters can counter their weaknesses. Fortunately, Charizard has a 4× weakness to the Rock-type, and both Blastoise and Venusaur are fairly slow, with Venusaur having many weaknesses. A powerful, diverse team is needed to take down Blue. Some recommended Pokémon are: Jolteon, Dewgong, Aerodactyl, Gengar, Lapras, Machamp, as well as the starter.

Once you defeat Blue again your new team is recorded in the Hall of Fame and congratulations for facing the updated Elite Four. This along with the Trainer Tower are the most challenging elements of the game and this will truly test your skill as a Pokémon Trainer.

← Part 16 Post-Elite Four: Four Island, Six Island, Five Island, Seven Island

FireRed and LeafGreen walkthrough

This article is part of Project Walkthroughs, a Bulbapedia project that aims to write comprehensive step-by-step guides on each Pokémon game.