I'm going to be a GM with 3 players, and we will be playing with the Pokémon Tabletop United rules.
In these rules, there's a whole part about Shiny Pokémon, that aren't just Pokémon with another set of colours like in the games. I had an idea that a Wailord, the biggest Pokémon, could have somehow mutated to become even more bigger. What I want is that Wailord to come at the surface and everyone would think it's an island because of its size.
Problem is: I have a player that I think will tell me things like "How could it be that big? How can it swim in the ocean? Why did nobody see that it was a Wailord?"
So I'd like to know what could be a good size for a giant Wailord to be mistaken for an island, so there's some things to explore and discover, but not too oversized to be somehow realistic?