Those are good move ideas for sure, while you're at it why not go further and create a Flying and a Grass one for use by the other Rotom forms. Even though those moves are generally useless, at least for the gimmick I'd like it.
Skill Shuffle
Type: Psychic
Accuracy: 100
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Skill Shuffle rotates a target's current ability with its secondary ability or dream world ability, at random. It will fail if the target only has one ability.
Bonus: if the target is mega-evolved, Skill Shuffle will rotate its current ability to one of its non-mega abilities.
Since abilities are so important in competitive play nowadays, this move could have an impact in battles, especially if it was a widespread move (by TM or Tutor perhaps). What makes this stand out over Entrainment, Simple Beam, etc. is that you could effectively cripple an opponent based on their abilities. I added the mega clause just because it would be pretty sweet to force a Mega Lopunny to be stuck with Klutz, unable to use its mega stone.