Shedinja is a unique Pokmon that can only be obtained by evolving a Nincada that has taken damage but has at least one HP remaining. To evolve a Nincada into Shedinja, the player must first have an empty slot in their party. When Nincada levels up while taking damage, it will evolve into Shedinja, leaving behind an empty shell that cannot be used in battle.
Shedinja is a powerful Pokmon with a high Special Defense stat. However, it has a very low HP stat, which makes it vulnerable to being knocked out by even weak attacks. Shedinja also has the ability Wonder Guard, which makes it immune to all attacks that are not super effective against it. This ability makes Shedinja a great choice for battles against opponents who use mostly non-super effective attacks.