in wally's house talk to his dad
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On Pokemon ruby to get surf you need to beat your dads gym (in petalburg) then after wallys dad will come and get you then give you surf.
Most Water Pokemon can learn surf in Ruby, like tentacool or wingull.
You teach it surf by using the Hidden Machine.
Catch a Marill or its lesser for Ezuirel then teach it surf.
Just about anywhere you can fish or surf.