Is this an error in Pokopia?

lauracat

I need Paldean Wooper in order to learn a certain move in Pokopia. In order to get it, I need to use MooMoo Milk Coffee to make muddy water, so I can have a marshy tall-grass biome. But in order to use MooMoo Milk Coffee, I have to have the move that Paldean Wooper teaches you to begin with! Is there a way out of this loop, or did somebody make a mistake?

UnovanZorua

There's a muddy water lake you're supposed to use in Bleak Beach.