Staryu
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Staryu is a Pokémon introduced in Generation I (Kanto).
It evolves into Starmie when exposed to a Water Stone. Staryu can't evolve into the Aurora Form Starmie.
There is a chance for Starmie to be reverted into Staryu when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3.