Yeah im pretty sure you can set up a magcargo on his volcarona and completely destroy his team without even breaking the mirrors
You can destroy him with talonflame or any special attacker
Galvantula proved helpful, yet i dont think vikavolt can do it
Anyway, avoid pure psychic types in this fight since they will be most likely useless
Mr mime can be useful with screens and light clay tho
After some X speeds, most rollout users will sweep the hell out of him (any slow rock type setting up xspeed will do tho)
And for masquerain, avoid intimidate on your physical attackers and he might go down very quickly
I recommend avoid using spinda in this fight (and in Serra's)