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Happiness is a measurement of how much a Pokémon loves its Trainer and enjoys being in their care. Happiness affects the evolution of, the power of Return and Frustration, and the availability of a few in-game items and ribbons. Certain events increase a Pokémon's happiness (gaining a level, walking 256 steps) or decrease it (fainting, using herbal medicine).

Happiness was introduced in Pokémon Yellow for the player's starting Pikachu only, and expanded to cover all Pokémon in Generation II.

Generation I

A prototype of the happiness system used by later games was introduced in Pokémon Yellow, the last main series game of Generation I. Like the later system, its value ranged between 0 and 255 inclusive, however, this value was only applied to the Pikachu the player started with.

Unlike later games, since Pikachu is outside of its Poké Ball, the player can turn and look at it at any time as it follows him around the overworld. Pikachu will then indicate its happiness in a small window that appears. At maximum happiness, Pikachu will jump up and down before the window appears.

Like later games, Pikachu's happiness will rise when it gains a level. If its Trainer uses an item on Pikachu, its happiness will also rise, even if it is an item that has no effect on Pikachu (such as a Potion at full HP). In this manner, Pikachu is much easier to make happy than Pokémon in future generations.

Pikachu's happiness drops if it is put into Bill's PC or faints. Trading it to another game will reset its happiness to 0.

Happiness is not recorded for any other Pokémon in Generation I, while the happiness of Pikachu does not affect much: the only real effect it has is whether or not Melanie will give Bulbasaur away in Cerulean City, which she will only do if its happiness is 147 or higher.

Happiness	0 to 99	100 to 199	200 to MAX
Event	Change
Gaining a level	+5	+3	+2
Using an item	+5	+3	+2
Challenging a Gym Leader	+3	+2	+1
Depositing in the PC	-3	-3	-5
Fainting	-1	-1	-1

Generation II

In Generation II the happiness system became fully implemented, building on the system used in Yellow by tracking the happiness of any Pokémon owned by the Trainer. Like before, it is a single byte with a value between 0 and 255.

Happiness is set when a Pokémon is brought under a Trainer's control: that is, it is 70 when a Pokémon is captured from the wild, and reset to 70 when a Pokémon is traded from another game. When a Pokémon is hatched from an egg, its value is set to 120. If a Pokémon is captured in a Friend Ball, rather than any other kind, its happiness is set to 200 instead.

Another function was given to happiness in Generation II, the evolution of certain Pokémon, which has continued until the present, with new Pokémon which evolve through happiness being introduced in each generation. Happiness-based evolutions occur when a Pokémon's happiness is 220 or higher.

Unlike in Generation I, happiness will not increase if an item that cannot be used is used on a Pokémon: for example, using HP Ups on a Quilava which already has the maximum HP it can have will not result in raised happiness.

Event	Change
Walking 256 steps	+1*
Grooming, Daisy	+3
Grooming, older haircut brother	+5*
	+3*
	+1*
Grooming, younger haircut brother	+10*
	+3*
	+1*
Using vitamins	+5*
	+3*
	+2*
Gaining a level	+5*
	+3*
	+2*
Challenging a Gym Leader or Elite Four	+3*
	+2*
	+1*
Fainting	-1
Using EnergyPowder	-5
Using Heal Powder	-5
Using Energy Root	-10
Using Revival Herb	-15
Trading to another game	Reset to 70

However, some things, though frequently reported, aren't part of the Generation II modifier. The following are actions that do not affect a Pokémon's happiness, either positively or negatively:

• Putting a Pokémon in Bill's PC
• Healing the Pokémon when weak and injured
• Giving a Pokémon a hold item
• Using a Pokémon in battles
• Winning battles with a Pokémon
• Letting a Pokémon's HP fall to critical status
• Letting your Pokémon get a status condition like Paralysis
• Walking when your Pokémon has a status condition

Generation III

Happiness in Generation III works much the same as before; however, additions were made to happiness-altering events. If a Pokémon is caught in a Luxury Ball, all happiness-raising events will rise by one point more, while happiness-lowering events are not affected. Likewise, a Pokémon holding a Soothe Bell will also rise by one additional point per happiness-raising event. These effects stack on each other, meaning a Pokémon in a Luxury Ball holding a Soothe Bell gets two additional points per event.

Pokémon now have a base happiness per species; however, most catchable Pokémon have the standard 70 points as their starting level.

Event	Change
Walking 256 steps	+1
Grooming, Daisy*	+3*
	+2*
Using vitamins	+5*
	+3*
	+2*
Gaining a level	+5*
	+3*
	+2*
Using EV Berries	+2
Fainting	-1
Using EnergyPowder	-5
Using Heal Powder	-5
Using Energy Root	-10
Using Revival Herb	-15
Trading to another game	Reset to base happiness.

Generation IV

Happiness in Generation IV is much the same as it is in Generation III, though the conditions are altered slightly. The Luxury Ball now causes a Pokémon to have a separate rise in happiness than Pokémon in other Balls.

Dr. Footstep, the sole resident of the Footstep House on Route 213, will give a Pokémon with maximum happiness a ribbon.

In HeartGold and SoulSilver, the player can gauge their Pokémon's happiness based on the phrase that appears when they are spoken to outside of their Poké Ball.

Daisy makes a return in HeartGold and SoulSilver. Visiting her in Pallet Town will let her groom one of the player's Pokémon between 15:00 and 16:00 every day, increasing its happiness.

The Haircut brothers also make a return in HeartGold and SoulSilver. The player can visit them everyday other than Monday to get a boost in happiness.

Event	Change	Luxury Ball
Walking 256 steps	+1	+2
Massage, Veilstone City	+3	+5
Massage, Ribbon Syndicate	+5	+6
Using vitamins	+2	+6
Gaining a level	+2	+6
Using EV Berries	+2	+6
Using healing items	+1	+2
Haircut brothers	varies*	?
Grooming, Daisy*	+10	?
Fainting	-1
Using EnergyPowder	-5
Using Heal Powder	-5
Using Energy Root	-10
Using Revival Herb	-15
Trading to another game/Pal Park	reset to base happiness.

Pokémon Ranger: Shadows of Almia

Two Pokémon in a Happy Mood

Happiness also has an effect in the second Ranger game. Partner Pokémon can have the condition of Fine, Happy, or Very Happy. When it is in a Happy Mood, musical notes come out. Black musical notes come out of it when it is happy. Multicolored musical notes come out when it is very happy. This may happen whether or not it is with the player. This state of mind increases the speed the Partner Gauge fills up due to more Partner Energy being given.

Evolutions

Several Pokémon evolve when their happiness level is at or above 220:

Previous evolutions		Happiness evolution			Future evolutions
Zubat  Poison  Flying	→ Level 22	Golbat  Poison  Flying	→ Happiness	Crobat  Poison  Flying	Crobat does not evolve
Happiny  Normal	→ Level up holding an Oval Stone	Chansey  Normal	→ Happiness	Blissey  Normal	Blissey does not evolve
Eevee is the lowest in its line		Eevee  Normal	→ Happiness (day)	Espeon  Psychic	Espeon does not evolve
Eevee is the lowest in its line		Eevee  Normal	→ Happiness (night)	Umbreon  Dark	Umbreon does not evolve
Pichu is the lowest in its line		Pichu  Electric	→ Happiness	Pikachu  Electric	→ Thunderstone	Raichu  Electric
Cleffa is the lowest in its line		Cleffa  Normal	→ Happiness	Clefairy  Normal	→ Moon Stone	Clefable  Normal
Igglybuff is the lowest in its line		Igglybuff  Normal	→ Happiness	Jigglypuff  Normal	→ Moon Stone	Wigglytuff  Normal
Togepi is the lowest in its line		Togepi  Normal	→ Happiness	Togetic  Normal  Flying	→ Shiny Stone	Togekiss  Normal  Flying
Azurill is the lowest in its line		Azurill  Normal	→ Happiness	Marill  Water	→ Level 18	Azumarill  Water
Budew is the lowest in its line		Budew  Grass  Poison	→ Happiness (day)	Roselia  Grass  Poison	→ Shiny Stone	Roserade  Grass  Poison
Buneary is the lowest in its line		Buneary  Normal	→ Happiness	Lopunny  Normal	Lopunny does not evolve
Chingling is the lowest in its line		Chingling  Psychic	→ Happiness (night)	Chimecho  Psychic	Chimecho does not evolve
Munchlax is the lowest in its line		Munchlax  Normal	→ Happiness	Snorlax  Normal	Snorlax does not evolve
Riolu is the lowest in its line		Riolu  Fighting	→ Happiness (day)	Lucario  Fighting  Steel	Lucario does not evolve

Happiness raters

Happiness raters are different NPCs that may be talked to to indicate the happiness of the first Pokémon in the player's party. Some will give away certain items depending on the happiness, while others just tell how happy the Pokémon is.

Sentence	Happiness
"It looks really happy! It must love you a lot."	250-255
"I get the feeling that it really trusts you."	200-249
"It's friendly toward you. It looks sort of happy."	150-199
"It's quite cute."	100-149
"You should treat it better. It's not used to you."	50-99
"It doesn't seem to like you at all. It looks mean."	0-49

Locations

• Goldenrod City, in the house northeast of the bike shop.
• Goldenrod Department Store, Sundays only, gives away one of either TM27 (Return) (happiness above 150) or TM21 (Frustration) (happiness below 100) weekly.
• Verdanturf Town, in the house in the south of the town.
• Pacifidlog Town, Once every week, gives away one of either TM27 (Return) (happiness above 150) or TM21 (Frustration) (happiness below 100).
• Pallet Town, at Blue's house, Daisy will judge a Pokémon's happiness.^{Wrong template. See Template:Sup/doc.}
• Hearthome City, in the Pokémon Fan Club.
• Route 213, at the Footstep House, Dr. Footstep will tell a Pokémon's happiness, albeit in a roundabout way which differs among Pokémon species.

In addition, the Pokétch App, Friendship Checker, will display a Pokémon's happiness on a scale of one to two small or big hearts.

Trivia

• The only regional Pokédex that contained all Pokémon that evolve by happiness at the time was the old Johto Pokédex. Neither the Hoenn Pokédex, Sinnoh Pokédex (before or after the expansion) nor the New Johto Pokédex contained all happiness-evolvers as of their respective generation, with the Sinnoh Pokédex excluding only Igglybuff and its family.

External links

• Generation II Happiness FAQ by Ignacio de Lucas
• Generation IV Happiness FAQ by Ruimound
• Pokémon Gold, Silver and Crystal happiness guide