Teach it to a Pokemon like Gyrados... then you can "surf" or go across water.
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Surf is HM #3. :-)
You will get the HM surf after beating the Norman then visit the Wally's father he will give the HM Surf. In the house left of the gym of petalburg city, but you will first need the 5th badge.
teach it the HM surf
you have to teach it the hm surf i believe.............
Get the HM Surf then teach it to a pokemon.