@Felix, Mario and Luigi Dream Team? I haven't played it yet, but I want to. I played Mario And Luigi Superstar Saga, and I loved that game. This song I swear reminds me very slightly of something from that game...
Oh, and Deoxy's theme from FR/LG/E This theme is pretty awesome, I want to hear this one like in a newer game remixed or something, it's a pretty sweet battle theme, even with gameboy level sound quality.
Oh and this isn't from the games at all, but the Lugia movie, but Lugias theme, This song is just so freaking beautiful, I learned part of it on Trumpet. So freaking beautiful I just love this song for some reason ;p.
