What's a good Smeargle moveset on Crystal? It's for in-game.

Spore is a given. What else? Seismic Toss?

I was thinking of having a Pokémon with the desired move fight a Ditto, then switch in Smeargle after it has transformed and sketch the move. Will this work? For the time being my Smeargle is on the Exp Share at level 25.