The English Master Quest and Battle Frontier themes, by far. The original English one still makes me want to bash my head against the wall, and I know nothing of the Japanese themes barring the awesome Battle Frontier one.
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Yeah, I don't like the Diamond and Pearl theme either. It's the only Pokemon theme I don't like.
I like the Battle Frontier theme, but it's way too short, so I don't care for it much (even the full version on the Pokemon X soundtrack is too short, in my opinion).
Actually, I agree mostly, but I'm not exceptionally fond of Battle Frontier and Unbeatable, either.You know, I think the only ones I don't like are Diamond and Pearl, with Orange Islands Theme as a runner up.
The rest (except the new one) I know by heart.