Shedinja

Shedinja (Japanese: ヌケニン Nukenin) is a /-Type Pokémon, and is the result of Ninjask's evolution from its pre-evolution form Nincada. Shedinja is not an evolutionary form like some might think, but is a byproduct of Nincada's evolution; the discarded husk. This Pokémon is said to have originated from a discarded bug shell, which came to life. Peering into the crack on its back is said to steal one's spirit. To get a Shedinja in Pokémon Ruby, Sapphire, and Emerald a person must evolve their Nincada into a Ninjask and have an extra slot open in their party. No matter how much a Shedinja is trained, its HP always stays at 1. This is not a problem as its special ability, Wonder Guard, allows it to take no damage, except from super effective moves.

Trivia

 * Despite having only one HP, Shedinja is able to learn Substitute though it always failed when used due to its HP.
 * No other Pokémon has the same type combination as Shedinja.
 * It is the only Pokémon to have the Wonder Guard ability.
 * Due to the ring that floating above the head of Shedinja, the design of it might be based on an angel.
 * Shedinja is the only Bug-type weak to Dark-type moves.
 * It is impossible to have a shiny Shedinja without the aid of cheat devices.
 * There are two ways to beat a Shedinja without using super-effective moves. Send a Pokémon that has the ability Mold Breaker, or another Pokémon that has a ability that ignores all abilities. Also, you can use a move like Worry Seed to change Shedinja's ability.
 * Shedinja has the lowest base stat total of all fully evolved pokémon
 * Shedinja is also the only fully evolved pokémon who has a lower base stat total than its pre-evolved form.