FusionDex

Sandzee sprinkles sand onto sleeping people and Pokémon to induce dreams. It then devours these dreams for a net energy boost.

If your nose becomes itchy while you are sleeping, it's a sure sign that a Sandzee is standing above your pillow and trying to eat your dream through your nostrils. When it curls up in a ball, it can make any attack bounce off harmlessly.