what do you mean by how is? but surf lets you ride on a water Pokemon in the water. You will also need it to get to the Pokemon league and you get the move surf from the elder of celestic town and you can use it outside of battle when you beat the hearthome gym leader.
from the champion's grandma
Cynthia grandma gives it to you
in the safari zone
surf left of jubilife to canalave
Celestic Town, after you beat the Gym Leader.
machop is a good hm slave. he can learn rock smash, rock climb, strengh,. in Pokemon emerald nincada is a good hm slave but in Pokemon pearl flash is not an hm. any water type can learn waterfal or surf espacially palkia.
Surf is HM #3. :-)
As long as you have the surf HM from Celestic town, you must earn your fifth badge to be able to surf along water. Hope this helps!
the HMs are strengh,defog,waterfall,surf,rock climb,rock smash,and fly
Get the HM Surf then teach it to a pokemon.
You get HM Surf and surf there
You need a water Pokemon and the surf HM