Swellow
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Swellow is a Pokémon introduced in Generation III (Hoenn).
It evolves from Taillow when given an Evo Candy. It is the final evolved form of Taillow.
There is a chance for Swellow to be reverted into Taillow when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3.