It is considered a special evolution of Nincada, appearing only when Nincada evolves into Ninjask at level 20, as long as there is an extra space in the player's party and an extra Poké Ball in the player's bag. An extra Poké Ball is not necessary to obtain Shedinja in Generation III.
Shedinja is a Pokémon based on a cicada's shed exoskeleton. Most of its body is light brown, but the abdomen is gray. It has four protrusions on its underside instead of legs; the top pair is brown, while the lower is gray. There are round protrusions on the side of its head with narrow slits for eyes. Two lines encircle its abdomen and a white halo floats above its head. On its back is a pair of tattered wings divided into three wingtips. A hole between its wings reveals that its body completely hollow and dark, as it possesses no internal organs. It is said that looking into this empty space will steal one's spirit. Its shell is very hard, which gives it strong defense but renders it incapable of movement. It does not breathe and floats without moving its wings. It lives in forests.
Shedinja first appeared in Can I Ninjask You a Question?, when Aqua Admin Amber, having been deprived of his Pokémon after being abandoned by Archie, borrows a Nincada from his comrade Shelly, which then immediately evolves into a Ninjask, putting Wattson in quite a pinch with the incredible speed it gained by the minute. Although the old Gym Leader eventually managed to defeat it, a Shedinja formed from the shell Ninjask shed and attacked him from behind, sending him sinking into the ocean.
In Sneaky Like Shedinja, Greta used Shedinja to exploit its Wonder Guard Ability, as well as the fact that it has one base HP, requiring no items to resuscitate itself.
Shedinja's hard body doesn't move - not even a twitch. In fact, its body appears to be merely a hollow shell. It is believed that this Pokémon will steal the spirit of anyone peering into its hollow body from its back.
Shedinja is a peculiar Pokémon. It seems to appear unsought in a Poké Ball after a Nincada evolves. This bizarre Pokémon is entirely immobile - it doesn't even breathe.
Shedinja’s hard body doesn’t move—not even a twitch. In fact, its body appears to be merely a hollow shell. It is believed that this Pokémon will steal the spirit of anyone peering into its hollow body from its back.
Shedinja is a peculiar Pokémon. It seems to appear unsought in a Poké Ball after a Nincada evolves. This bizarre Pokémon is entirely immobile—it doesn’t even breathe.
Game locations
This Pokémon was unavailable prior to Generation III.
From Generation IV onwards, a basic Poké Ball (a requirement for evolution) is removed from the bag upon evolution to produce a Shedinja. In Generation III, Shedinja instead copied the ball Nincada was in; this is the only legitimate way to get a Shedinja in a non-standard Poké Ball.
Shedinja inherits the same game of origin, personality value, IVs, EVs, OT, Trainer ID number and Secret ID number, and met location as the Nincada that shed it. It also inherits the Pokérus if the Nincada had it. Among other things, due to keeping the same game of origin, personality value, and Trainer and Secret ID numbers, Shedinja will be Shiny if and only if the Nincada was Shiny.
The Shedinja shed from a Nincada has no nickname, and the player is not given an opportunity to nickname it. The only way to give Shedinja a nickname is for the Nincada's original Trainer to take it to a Name Rater.
Shedinja's Wonder Guard Ability renders it immune to 13 of 18 attack types, the most of any Pokémon; five of these immunities (to Ice, Bug, Steel, Dark, and Fairy) are entirely unique to Shedinja. This also gives it a few further distinctions:
If Soak is used to make Shedinja a Water type, it will have immunities to 16 of 18 attack types, all but Water and {{t|Electric}
If Forest's Curse is used to add Grass to Shedinja's types, it will have immunities to 12 of 18 attack types, gaining an Ice-type weakness.
From Generation IV onward, Shedinja is the only Pokémon that can knock itself out from full health with the recoil damage from Struggle.
Outside of battle, Shedinja immediately recovers from poison after four steps in Generation IV; in Generation III, it will immediately faint after four steps.
Despite it being able to learn Substitute, Bide, and Rest, they will always fail; consequently, the only way Shedinja can have a substitute is via Baton Pass.
Although Shedinja can learn Sandstorm, it cannot normally use it without making itself faint.
If Shedinja uses Pain Split (via Mimic), it will cut the target's HP in half, similarly to Super Fang.
Shedinja is the only Pokémon that has its HP restored to maximum when leveled up with a Rare Candy (prior to Generation VI) or revived with a Revive.
In Generation V onward, if a Shedinja has Sturdy (for example, being hit by Worry Seed followed by Skill Swap with something with Sturdy), it can survive any damaging move or confusion damage.
If a Shedinja is holding a Focus Sash, it can survive any single damaging move or instance of confusion damage.
Shedinja is the only Pokémon that will never recover HP with Leech Life.
It is based on the shed husk that cicadas leave behind when they finish their metamorphosis into adults. Concerning its species' ninja theme, it also appears to be a reference to the fabled ninjutsu technique 空蝉 utsusemi, where a ninja uses a dummy or replica of itself to evade and escape from threats, and where its namesake also alludes to the cast off shed husk of a cicada. It may also be based on a guardian angel, due to the halo-like object floating above its head. Its Ability Wonder Guard probably alludes to this.
Name origin
Shedinja is a combination of shed (to cast off skin or exoskeleton) and ninja.
Nukenin is a pun on 抜け忍 nukenin, a term for ninja who have abandoned their clan and lord. It also combines 抜け殻 nukegara (casting off skin) and ninja.