you can do both just has to be between the fight area and resort area
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When you surf in the basement of Victory Road, there should be some Lapras hanging about.
Lapras can't learn surf through leveling you have to use HM3 which can be acquired at the end of the Safari Zone in Fuscia City.
Teach it the move Surf using HM3.
go to victory road in the back of 1F 2 and surf on the water.
You can't fish up Mantyke. You have to surf to find it. Try Route 223.