I would suggest holding this off for your second or any repeated playthrough after your first (especially if you end up grinding out all of the experience you need to get Lv.99 for everyone). The only battles you can't avoid are story related (and forced into, thus meaning you won't gain experience from them sometimes too). There is no way to keep track of this on the actual game, so either repeatedly escape and hope to see it pop, or keep track of it yourself.