Teach Charizard and Blastiose Earthquake (for thunder types)
Teach Venusaur Sloarbeam and cut, but keep sleep powder
Mewtwo: Ok...
Mew: Change Overheat to Psychic
Pikachu: I'll leave this one alone.
Overall: Thunder and Bug types are your biggest threats, but Bugs are barely used by trainers.
Are you satisfied? Or do I have to beat the c*** outta you too?