You insert emerald in gba slot then go to route 203, other than that nothing.
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You get pineco by headbutting trees.
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.
Pineco evolves into Forretress at Level 31.
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!
you can find a pineco in ilex forest using headbutts in trees.