No Hyper Beam please. Two Rock Slides with STAB or Earthquakes deal more damage than a Hyper Beam.
T-Wave, Sub, Taunt or Aerial Ace are options for the last moveslot. Taunt is the standard move, but it's a bit hard to pull off ingame. It's there to stop the foe from statusing you or reducing your stats, and to prevent them from stating up themselves while you Dragon Dance up. Same applies for Substitute, where they can't status you with a Sub up. T-Wave disables the foe by paralysis, and Aerial Ace is there if you're really afraid of Heracross or Breloom. Personally I'd pick Sub ingame, though T-Wave isn't bad either.