Note: You need Headbutt.
New Bark Town Headbutt Trees.
CherryGrove City Headbutt Trees.
search him on your pokedex and it will be red instead of green that means you need to headbutt a tree using headbutt.
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headbutt trees
Pineco evolves into Forretress at Level 31.
use headbutt on trees
level 31
To get Forretress you need to evolve a Pineco. To get a Pineco you need a Pokemon that knows Headbutt. Use Headbutt on a tree and a Pokemon will fall out. This can be a Pineco. Ilex Forest is an example where you can come upon Pineco by headbutting treees.