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)
Double-Edge, Earthquake, Return, Facade, Knock Off, Outrage, Seed Bomb, Power Whip
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.