dragon pulse because outrage can confuse your reshiram. plus if you have a high friendship with your reshiram, go to Opleucid city and go to the west of the Pokemon centre and head up the path by the electric keybord dude (north) and go into draydens house. he will teach any of your dragon types the powerfullest dragon type move: draco meteor. it can be an backup for your reshirams dragon pulse.
I also recommend this move set (since I have a reshiram myself.)
fusion flare (fire) - awesome move, powerful too
fly/ fire blast (if you want to fly to some where and you don't have a flying type that can learn the move fly, use this. if you already have a Pokemon that can learn the move fly, use fireblast since it goes with the fire theme.)
dragon pulse - better not use outrage mate
draco meteor - backup for dragonpulse.
-hope I helped!