Hm, I've never really thought of this before. From those listed above, I have come to the conclusion three are tied:
- Koga: Very dedicated to his battling and takes matters very seriously. The fact that he became an Elite Four member in the later games and managed to battle even better as such (unlike Wallace) had a rather large impact on my decision, as well.
- Blaine: I just love everything about this guy: his appearance, his attitude, his fiery personality, you name it! The battle he put up with Ash in the anime was simply amazing, as well.
- Norman: The fact that he happens to be the player's father is most noteworthy for me. You learn about this at the very beginning of the game but don't actually get to battle him for quite some time, so you really have something to look forward to. On top of that, he's seriously good.