I don't see Niantic implementing any way of changing moves anytime soon, getting mons with high IV and best moveset is what keeps people playing at higher levels after the pokédex is almost completed, if we can get those moves from any other place than playing hours and hours to get the candies, hatching eggs and random luck they would lose money.
I would love they implemented some sort of TM's like on the games, but don't think it will happen.
