You can find pineco on Route 203, 204, 210, and 229. You can also find it in Eterna Forest, however; to find pineco, you must have Pokemon emerald inserted in the gameboy advanced slot of your ds. You need to have the National Dex (which is obtained after seeing all the Pokemon in Sinnoh Region,) and you must have defeated the Elite Four before this will work. Good luck!
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teach headbut to a Pokemon (anyone can learn it), then headbut the tree on route 31 that is by itself. pineco will then appear around lv 4.
You insert emerald in gba slot then go to route 203, other than that nothing.
Catch palkia first.
Pineco evolves into Forretress at level 31.
You get pineco by headbutting trees.