Graag is a Water type Pokémon. Graag is No. 091 on the Pokédex. It evolves from Declime with a Water Stone. It is a sprite-swap of Cloyster, and as such shares Cloyster's typing, base stats, Pokédex data, icon, cry, shiny palette, and learnset.
Graag's backsprite is completely blank, so it will be invisible if it's the first Pokemon sent out on the player's side, or if it is not the first it will use the backsprite of the last Pokemon sent out but with the wrong palette. It shares this trait with its (unintentional?) pre-evolution, Declime. Bizarrely, its frontsprite appears to be a misplaced backsprite.