I've liked quite a few themes from the Pokemon games.
They include:
-Agate Village from Pokemon Colosseum/XD
-Miror B's Retro Groove and Mirakle B's Imitation Groove, both from Pokemon Colosseum (they are quite similar, but the latter has different instruments and is a bit faster)
-Elite Four battle theme from Pokemon Diamond/Pearl/Platinum
-the battle music for Mewtwo in Pokemon Fire Red/Leaf Green, and for Mew in Pokemon Emerald
So yeah, I just can't resist music when it's up or down a semitone or two.
Edit: Oh, there's also the Kanto gym leader music from Pokemon HeartGold/SoulSilver; I really like that one too.