For example, a Poisoned Cascoon evolving into Dustox, who now has the Poison type. Since Poison types are immune to the status problem itself, what would happen?
... Also, poisoned Pokémon who evolve into a Poison- or Steel-type Pokémon, such as Cascoon evolving into Dustox, will keep the poisoned status after evolving.
Source: Bulbapedia/ Poison
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