I think you should add some type of ice type, I'll let you pick the specific's
A good move set for Mew would be:
Aura Sphere/Brick Break
Psychic
Energy Ball
Thunderbolt
(you want to get a lot of powerful attacks for Mew since it has such high attack AND special attack)
A good move set for Tyranitar
would be:
Crunch
Earthquake
Flamethrower
Thunderbolt
Hope this helps :)