Here are some Bulbasaur/Venusaur moves that are good. Make sure to evolve Bulbasaur by at least level 98 otherwise you won't be evolving it.
Sp Attack moves:
Solarbeam, Leaf Storm, Petal Dance, Grass Knot, Energy Ball, Sludge Bomb, Hyper Beam (if you like those kind of moves, but want a more reliable Grass attack than Frenzy Plant)
Attack moves:
Double-Edge, Earthquake, Return, Facade, Knock Off, Outrage, Seed Bomb, Power Whip
Stat moves:
AMnesia, Ingrain, Curse, Grasswhistle, Charm, Safeguard, Light Screen, Block, Worry Seed, Synthesis, Substitute, Rest, Sleep Talk, Sunny Day, Swords Dance, Protect, Toxic, Roar, Sleep Powder.
For more concrete movesets, go to the links given by Pokemaster.