probably the same way you got it in gold and silver before battle all the girls with eevees evolutions in ecretek city(expect glaceon or leafeon i don't really know) and the man with the rhydon will give it to you after youhave defeated them all.
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there are a lot of Pokemon that can learn surf but mostly water type Pokemon can learn surf but did you know that snorelax and rydon can lean surf
Basically any water type can learn surf
Use surf in route 35
All water pokemon!
Actually, there are no Pokemon at all in The Scorched Slab. Just TM11. It is at the top and route 120, in the water. (Surf on the first pond on route 120 from Fortree.) All you need to get there is HM04 (Surf).