So I haven't seen this anywhere so i think hasn't been picked up yet, but while using nature power the first time it was energy ball then the opponent used misty terrain and it became moonblast! I haven't tested out grasy terrain or electric terrain yet, I also wondering other field altering moves, I.E. Trick room, magic room, wonder room, rain dance, sunny day, hail, sandstorm, tailwind, sticky web

I don't think it does anything with the rooms, but it does become Thunderbolt in Electric Terrain. I haven't tried Grassy Terrain myself, however.

You forgot to add the Pledge combinations to that list. Whether it would matter which side is being afflicted by the moves, though…