Instructions
Find a Pokemon -- such as Bidoof, Bibarel and Slowking -- that knows the Headbutt move.
Stand next to a small tree along one of the many routes in the game. Routes 1, 8, 22 and 39 are a few of the many areas where Pineco hide in trees.
Face the tree and access the list of Pokemon in your party. Select the monster that knows the Headbutt and use the move. If a Pokemon is in the tree, it will fall out and attack you.
Continue using Headbutt on trees until a Pineco appears. Harm the Pineco until its health bar turns small and red, then throw a Pokeball at the Bagworm Pokemon to capture it.
Raise Pineco̵7;s experience level to 31 and it will evolve into Forretress. Pokemon level up by gaining experience from winning battles, so use Pineco effectively in battle to quickly evolve it.