The GameBoy Pokémon games are pretty simple to do; there are only 3 voices to pick out, and it's especially easy when you have the Audacity (geddit) to slow the track down 75%. Dynamics/articulation etc. don't matter that much in these cuz it's all synthesized 'n' shit.
Sheet music (PDF) can be found HERE
I'm thinking about doing formal analysis on the battle music of the first Pokémon games, because it sounds like a neat idea. Yes, formal musical analysis of Pokémon music.