Morty, the forth gym in Eckruteak City. He uses ghost types: Ghastly, Haunter, Haunter, and Gengar. Then go into the dance hall and continue story mode and you'll get surf.
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use surf to get to seafoams islands go up the ladder and battle to the gym leader
The Gym in Blackthorn City. The gym's special Pokemon type is dragon. After you beat the gym you can use waterfall
cerulean cave after you beat all the gym leaders
After you beat the eighth gym you are allowed to use the HM waterfall
Use dark, ghost, or bug moves.