Fighting, duh. I'd be the 4th. Here goes:
Mankey M: 27 (x2)
Heracross M: 31
Machoke M: 27
-Smack Down (Probably the only move I'd end up using)
My trainers would just have a bunch of level 25 Machops and Mankeys. Plus one with a level 30 Primeape. The TM would be Brick Break.