Ever thought it'd be cool to have your art, writing, or challenge runs featured on PokéCommunity? Click here for info - we'd love to spotlight your work!
Welcome to PokéCommunity! Register now and join one of the best fan communities on the 'net to talk Pokémon and more! We are not affiliated with The Pokémon Company or Nintendo.
As far as I know, you can't find any areas to make Secret Bases underwater. The only places are in rocky areas (they have a small indent to indicate that), bushes and trees scattered on various routes.
I'm not entirely sure how underwater bases would work because how would we put our decorations underwater? Might be an odd question seeing as we can already battle underwater, but still. Anyway, locking this, next time please use the Quick Questions thread. :)