You need to get a Pineco to evolve into it at level 31. You can get a Pineco after reciving the National Pokedex at the end of the game and inserting an Emerald cartridge into your DS. They will become available at Routes 203, 204, 210, 229 and Eterna Forest.
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it is not in Pokemon heart gold or Pokemon soulsliver. the only whey to get it is to evolve it from pinnco.
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.
Pewter museum!! :D
Pineco evolves into Forretress at Level 31.
Forretress does not evolve.