I bet he's totally useless in it or just doesn't care. Like, they will fight an embodiment of pure order, or Discord will be on "Vacation".
Cough cough Celestia. "Hey look, Discord is back. I'm gonna go and hide in the castle." "Hey look, it's a changeling. I, a demigoddess/goddess am gonna get my butt kicked by one laser beam." "Hey look, my niece is acting really weird. Oh well. I'd better go punish Twilight."