It's better than hydro pump as it has better accuracy, so yes.
Gyarados cannot learn the move Hydro Cannon. Hydro Cannon is a move that can only be learned by the Water type Starter Pokemon.
hydro cannon
Water Spout, Sheer Cold, Hyper Beam, Hydro Pump, Eruption, Hydro Cannon.
be at lvl 72 with an IQ of 3 stars or more
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.
Hydro cannon
A move tutor on two island will teach it hydro cannon if its level 50.
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.
It won't learn hydro cannon because its a move taught by a move tutor in firered and leafgreen.
Hydro Cannon
Hydro cannon :)