Hes in pastoria city in one of the houses you need a heart scale to let him teach your Pokemon a move.
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You can use heart scales at the Move Re-learner in Pastoria City. He reteaches your Pokémon a move for every heart scale used.
The move re-learner is in Seaspray town, the house directly right of the mall.
Blackthorn city
Yes. He is in Blackthorn City
The Hydro Cannon Move Tutor is located in Blackthorn City in the same house as the Move Deleter and Move Re-learner.