Please use the Help thread in future.
I have had a look around, and there does not appear to be any list of the Pokemon that they used, unfortunately - I believe this probably would have been a tough thing for people to collect info on, really. I'd say however that each trainer would possible have Pokemon out of a rather large pool, actually, rather than a separate pull for each trainer.
Either way, after searching, I don't believe there is such a list. At any rate, if you want some other info on the Battle Frontier, there's the
Battle Frontier FAQ here.
Closed. (If you happen to know of such a list, VM/PM the TO please).
EDIT: There
IS such a list, that has recently been found, it appears.
http://www.upokecenter.com/games/emerald/guides/bftrainers.php - list of trainers and what Pokemon they have (listed in form of numbers).
http://www.upokecenter.com/games/emerald/guides/bfpokemon.php - list of the Pokemon they can use, numbered (hence by using the above, you can see what Pokemon each trainer can have).
Messy and all, but certainly a list that exists. How about that.