There is really new moves to add?
I was thinking about wich moves could come with gen 3 and then i have looked for it at list of TMs for original games, like emerald. But happens that i didn't find any new move...
No move that is not in the game yet and has damage mechanic
Answers
Instead of new moves make updates to current moves.
Fire Blast: 140 PWR Target stunned for 2 seconds
Psychic: 100 PWR Target losses 80% of charge attack bar
Heat Wave: 95 PWR Target burns additional 10 PWR per second for 5 seconds.
Sludge Wave: 110 PWR Targets attacks slows 50% for 4 seconds
Ominous Wind: 50 PWR Target is unable to dodge for 3 Seconds. (If 1v1 ever gets implemented)
Disarming Voice: 70 PWR creates bubble to protect form any impairing effects for 4 seconds
Bug Buzz: 90 PWR Pokemon restores 5hp when used (bug hp sucks anyways so won't be big difference)
Rock Tomb: 70 PWR Reduces incoming dmg by 80% for 2 seconds
Just some ideas that Niantic could implement easily everyone seems to be bored with the current mechanics that they are to simple. This wouldn't have to create a new type of move but will be implemented into the charge move. Everyone compares Pogo to the games but its not the games it can be something new and something very good.