These are the moves it can learn by leveling up:
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none
yes but you don't know what moves the day care lady will change
moves like bite, flame wheel, flamethrower lvl 50, take down
Lots. Earthquake, horn drill, mega kick etc...
It only learns one move, Petal Dance, at level 44. If you do not evolve your gloom until then, it can learn other moves. But, like most Pokemon you use stones on, they learn very few, if any new moves. My suggestion, if you already evolved Gloom, is to use TMs.