shedinja
Pokémon #0292 in the National Pokédex, a Bug/Ghost-type.
The discarded exoskeleton of a Nincada, left behind when it evolves into Ninjask. It has a halo, a hole in its back, and is always floating.
Along with its unusual obtention method, this Pokémon is notable for being the only one with a HP base stat of 1, and its "Wonder Guard" ability, which protects it from any attack that isn't super-effective.
Japanese name: Nukenin