Steelix
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Steelix is a Pokémon introduced in Generation II (Johto).
It evolves from Onix by trading. It is the final evolved form of Onix.
There is a chance that Steelix will be reverted into Onix when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3 or an Everstone if it evolved through trade.
Other forms
Shiny
