well, just defeat Norman in petalburg gym. and then go to wally's house and talk to his dad and he'll give you the HM move Surf...,,
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All you do is go to your bag find your surf HM clickk on it and go to use then use it on the appropriate pokemon it isnt that hard
first you have to beat your father's gym then talk to wally's dad in the same town (he is the top left corner house and he will give you the hm surf
Surf is HM #3. :-)
you get from alder at twist mountain.
Try to surf you may find it