Earthquake-Duh
Sludge Bomb/Aerial Ace
Sludge Bomb-Covers Grass types, chance of poison
Aerial Ace-Also covers Grass types, has lower power, but never misses and also covers Fighting and Bug types
Stone Edge/Rock Slide/Ancient Power
Stone Edge-Very nice power, covers Ice types, as well as Fire, Flying and Bug types, high chances of critical hits, but slightly low accuracy
Rock Slide-Lower power, slightly higher accuracy, same type coverage, chance of flinching
Ancient Power-Even lower power, again, same type coverage, but has 100 accuracy and a 10% chance of raising all stats by on stage each
Night Slash/Sucker Punch/Toxic/Hidden Power (Electric/Grass)
Night Slash-Covers Psychic and Ghost types, high critical hit ratio
Sucker Punch-Higher power than Night Slash, same type coverage as it, priority, but will fail if the opponent doesn't attack afterwards
Toxic-Very helpful move, won't work on Poison and Steel types, but you've always got Earthquake to deal with them
HP (Electric/Grass)-HP Electric covers both Water and Flying types, HP Grass also deals with Water types, as well as Ground and Rock types, so it doesn't really matter which