In Route 229 north of the Resort Area battle your way through the area until you reach a lone house. In there you talk to the Old Coot. You must have one of the three starter Pokemon from any of the Pokemon games. And if your Pokemon has enough happiness (check with the friendship checker), he will teach it its powerful move. Fire types learn Blast Burn, water types learn Hydro Cannon and Grass types learns Frenzy Plant.
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The Hydro Cannon Move Tutor is located in Blackthorn City in the same house as the Move Deleter and Move Re-learner.
Yes, if you go to Blackthorn City, there is a old man in the Move Tutor house. He teaches all the starter Pokemon their ultimate move. In the case for water type is Hydro Cannon, fire is Blast Burn, and grass is Frenzy Plant.
Why do you need a cheat code for Hydro Cannon????????????????????????????? If you have a Blastoise, Swampert, Feraligatr, or Empoleon you just have to bond with it and you can learn the move WITHOUT messing up your game with hacks.
Hydro Cannon
Zap cannon is a move in the Pokemon series of games. It is not possible to get this move as a TM.