go back to jubilife city then to get to canalave city use surf at the left of jubilife city.Or go to hearthome city and try to deafeat fantina.Or if in platinum go to pastoria city and battle Wake.
Chat with our AI personalities
Get the HM Surf then teach it to a pokemon.
You get Surf from the elder of Celestic Town.
Surf is HM #3. :-)
On water.
you surf