Level Down

Pikachu lost 20 XP!

If you ever do get stuck in a Pokémon playthrough - there is always the option to just do some grinding battling some wild Pokémon to strengthen your team.

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Well - what if every battle your Pokémon fight causes them to lose XP? How about using a Rare Candy instead? Nope - that causes your Pokémon to level down too.