Shedinja is an evolutionary 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.
One may get a Shedinja in the games where he or she has to evolve the 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 one as its special ability, Wonder Guard, allows it to take no damage, except from super effective moves.
Due to the ring that floats 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.
There are two ways to make a Shedinja faint without using super effective moves; one is where the player must send a Pokémon that has the ability Mold Breaker, or another Pokémon that has an ability that ignores all abilities. Also, a Pokémon can also use a move like Worry Seed to change Shedinja's ability.
Weather like Sandstorm and Hail affects Shedinja, causing it to faint.
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.
It has the same nature and characteristic as Nincada, despite being a whole new Pokémon.
It has the same attack as its Ninjask at the same level.
Its name is a mixture of the words: Shed and Ninja.
Status ailments and recoil damage can hit through Wonder Guard, which causes Shedinja to faint.