'Nightmare' is not a pokemon in any game.
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level 38 because it trick room nightmare and psycic
Munna doesn't evolve by level, you need to give it a moon stone. I suggest you evolve at Lv.29, after it learns Nightmare. You will obtain one after defeating the final Team plazma in Pinwheel forest by Leader of Normal Type for getting back the dragon skull.
It is suppose to evolve at the Level of 20,but if you want it to evolve later it can evolve anything after it is at Level 20.
It will evolve by level. Teddiursa will evolve into a Ursaring at level 30.
They evolve at level 36