I think your team is pretty good, just you should use Registeel to set up stealth rock first turn rather than seismic toss. I'm not sure what kind of Sceptile you run, but if its special, you should remove Charizard for a physical attacker, and I would suggest Drapion for that, because it seems it can give your team better coverage. All in all, I think your team is good, but you just need to teach a couple of them better moves and perhaps strategize slightly better =)