You have to get the move Surf. Then teach it to a Pokemon. After that if there is a place where you want to Surf press A.
all water types see serebii.com
you click on the water with a Pokemon with surf
Basically any water type can learn surf
When using HM Surf or fishing
surf on water or get a fishing rod
All water pokemon!
Use surf on a pond or use thefishing pole
I know but how do u use it? :) Cambri
Use surf in route 35
it's east of newbark town. use surf by the water and it'll bring you to the pkmn league.
Route 19 during a Swarm and you have to use Surf.
there are a lot of Pokemon that can learn surf but mostly water type Pokemon can learn surf but did you know that snorelax and rydon can lean surf