I'm pretty sure this thread was originally created talking about Platinum, but since it was moved by a mod...well, now I guess its for the series as a whole, eh? XP Some people seemed confused, heh.
Well, now, overall... not much. Probably a lot in the original Red and Yellow, hahah. Maybe Silver and Crystal, too. But I try my best to keep my team well-leveled and stock up on potions XD But it's inevitable sometimes really. I just...don't keep count :P