Dragon Pulse-Good STAB, accurate, super effective vs. other dragon types
Flamethrower-Covers Ice
Hydro Pump-Covers Rock
Draco Meteor/Hidden Power-Draco Meteor gives good STAB and power but you don't really need 2 dragon moves, For Hidden Power you'd have to find out what your Bagon's is to see if its worth keeping
A special moveset for Salamence is worth keeping if it works into your battle strategy, since its usually unexpected.