Forretress doesn't evolve.
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Forretress cannot evolve that's the final evolution
Forretress does not evolve.
Pineco evolves into Forretress at level 31.
Pineco evolves into Forretress at Level 31.
Use headbutt on a tree and catch a pineco. then evolve it.Get a Pineco via Headbutting a tree. You can headbutt trees at places such as Ilex Forest to get one. Level it up to level 31 and it should evolve into a Forretress.