Answer: you can get it at Wally's father's house and talk to Wally's father.
Don't forget you need to beat your Dad first.
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Surf is HM #3. :-)
you have to beat your dad's gym and then go talk to Wally's parents, who gives you the HM surf
Get the HM Surf then teach it to a pokemon.
To get surf in ruby, sapphire and emerald you need to beat the 5th gym (your dad) and go to wally's house (same town) then one of the people in wally's house should give you the surf HM
if you have the HM FLY then you can fly there or you can surf but by some repels if you are going to surf