It learns Harden at level 7, and that's it.
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Lv. Move 23 Body Slam 43 Earth Power 58 Superpower
Ninjask is a Bug and Flying type Pokemon that evolves from Nincada at level 20. In the third generation it learns new moves at levels 20, 25, 31, 38, and 45.
some Pokemon do learn some don't
Mew learns a new move exactly every 10 levels and, of course, you can teach it TMs, HMs and Move Tutor moves as well.If you'd like a detailed list, the related link below is very helpful.
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.