In regards to the whole pokemon battling thing and how it could relate to being a pokemon sommelier, here are my two cents on the issue:
One of the aspects of being a sommelier requires you to be able to "taste" (or "sense" since I'm sure that sounds a bit creepy for some of you :P) the relationship between pokemon and their trainers. So, I guess that means that they could also sense which moves the pokemon is most comfortable using or would produce the strongest results? I mean, perhaps that's why Dent was fanboying all over Ash after his win :P
Basically, the one with the better "tasting" skills would win the battle under certain circumstances?
Crazy speculation, I know~
Also, I'm sure this has been mentioned before, but in the games, you'd have to face off Dent if you chose an Oshawott as your starter. Hahaha...
*brick'd for obviousness*