Pomeg glitch

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The Pomeg Glitch is a glitch exclusive to Pokémon Emerald Version that involves the use of a Pomeg. The glitch involves forcing a Pokémon into negative HP by using a Pomeg Berry to lower its Max HP by 2.

Performing the Glitch

To perform the glitch, one must use a Pokémon that has been EV trained in HP such that, upon using a Pomeg Berry on it, its Max HP will decrease by 2. (one may also use 8 HP Ups on it when it is around Level 60) Then, it must be poisoned and be walking around until only 1 of its HP is left. Then, cure the poisoning and use a Pomeg Berry on it. Its HP will decrease by 2, but won't become -1. It will instead have their current Max HP with the digits "35" after. At this point, the glitch is complete, though there are two very interesting sub-glitches that can be performed from this point. To perform either of them, one must first save. And from this point on, the Pokémon that was just glitched is referred to as the "Pomeg'd Pokémon".

?????????? Sub-Glitch

After the Pokémon has been glitched by the Pomeg Berry, the player must head to a PC and make sure that the only Pokémon in their party are the Pomeg'd Pokémon and a normal Pokemon. The Pomeg'd Pokémon should be at the front of the party. Then the player must head to any area and become caught in a wild battle. Defeat (or run from) the wild Pokémon using the POMEG'd Pokémon. After the battle, the player must come to the Pokémon menu and switch the Pomeg'd Pokémon and the normal Pokémon.

Without getting into any battles, the player then heads back to a PC to deposit the normal Pokémon. Then he or she returns to an area where one can fight wild Pokémon, but not to fight yet. First, any healing item on the Pomeg'd Pokémon and it will faint, but one doesn't white out and will be able to walk around with no usable Pokémon. Now, then one must get into a wild battle. Because of the party-switching earlier, and because the Pomeg'd Pokémon is now fainted, the player will now send out ??????????. (which is what happens if you manage to start a battle with no usable Pokémon or what happens if one doesn't own any Pokémon in in their party and enters a battle). And like most known variations of ??????????, it will have no HP, no attacks, and will faint instantly.

Pomeg Egg Sub-Glitch

After the Pokémon is glitched by the Pomeg Berry, the player must head to a PC and ascertain that the only Pokémon in their party are the Pomeg'd Pokémon and the Egg one wishes to battle with. The Pomeg'd Pokémon should be at the front of the player's party. Then the player heads to any area that can get them into a wild battle. Defeat (or run from) the wild Pokémon using the Pomeg'd Pokémon. After the battle, the player must come to the Pokémon menu and switch the Pomeg'd Pokémon and the Egg. Then any healing item (Potion, Berry, etc.) must be applied to the Pomeg'd Pokémon. It will faint, though one doesn't white out and will be able to walk around with no usable Pokémon. Then the player must enter a wild battle. Because of the party-switching earlier, and because the Pomeg'd Pokémon is now fainted, the player will now send out the Egg. The Egg is almost exactly like a normal Pokémon as it has moves, stats, a gender, it's at Level 5, etc. Though the only difference is that its color palette is glitched. The player then must revive their Pomeg'd Pokémon (returning it to normal) and switch out, ascerting that the Egg doesn't faint. Upon winning the battle, the player will find that the Egg can gain EXP, learn moves, and even evolve. But, by reviving the Pomeg'd Pokémon, the player returns it to normal, meaning that to battle with the Egg again, the player must perform the glitch again. However, the player will have to revive the Pomeg'd Pokémon or white out, even if the battle with the Egg was won.

Explanations

POMEG Glitch

The reason your Pokemon goes into ?35 HP is because by lowering your Pokemon's max HP by 2 while its current HP was 1, you subtracted 2 from 1. Your Pokemon's HP should've become -1, but the type of variable the game uses for HP can't store negative values, so if it goes below zero, it "loops" back up to its maximum value: 65535. (it displays as ?35 because the game tries to display 655 as one digit; unlike previous games, however, it just shows up as a question mark instead of a glitched text character.)

?????????? and Egg Subglitch

For the same reason, using a healing item on the POMEG'd Pokemon faints it, because the variable can't go higher than 65535 so it "loops" back around to 0. However, you don't white out because the game doesn't check for usable Pokemon after healing, as under normal circumstances healing wouldn't faint a Pokemon.

Egg Subglitch

An EGG is exactly like a normal Pokemon. The only things different about it are a few values that tell the game it's an EGG. The game sees these values and prevents you from looking at an EGG's true stats or sending it out into battle. The reason you're able to battle with an EGG is because by switching your party around and fainting your POMEG'd Pokemon, you are able to trick the game into overlooking the EGG-specific values.