Poké Floats is a stage similar to Rainbow Cruise, since both are naturally fixed-camera and scroll. The fighting is on top of giant Pokémon floats (hence the name) which are in a constant cycle. Staying on a certain float too long will cause the player to lose stock if the float goes off the screen. It is a good idea to practice on this stage first before engaging into actual battles, as the floats appear in a pattern, as opposed to random. A caution is that the floats tend to become harder to predict as the loop goes on, until it resets back to the first one.
The Sudowoodo trophy is unlocked upon unlocking this stage.