Silvally

Silvally (シルヴァディ) is a -type Legendary Pokémon introduced in Generation VII.

Physiology
Aside from the removal of its helmet, Silvally differs little from its pre-evolution. Its crested, bird-like head is revealed, possessing a metallic beak, two bolts on either side of its head, pointed red ears and a crest on its head resembling a cockatoo's. The fur around its neck and the fin on its tail also turn from grey to white upon evolving.

Behavior
Despite being a rough Pokémon, it trusts its Trainer and will do anything to protect them when they face dangers. The weight of the helmet slowed it down, and upon its removal, Silvally's speed increases substantially.

Natural abilities
As it was based on a "Pokemon spoken of in mythology" in legends from Sinnoh libraries (heavily implied to be Arceus) it possesses great power as it was created as a chimerical fusion of cells from all 18 types. As such, with the use of its Ability, RKS System, Silvally can change between types when holding a Memory Disc.

Trivia

 * Technically, Silvally (then called Type: Full) came before Type: Null as it was too powerful to control and such fitted with a helmet to limit its power.
 * This may be a canon example of de-volution.
 * According to the dex entry, the name "Silvally" is made by Gladion himself.
 * Silvally itself appears unchanged upon evolution, only removing its helmet and turning its tail and mane white. This is similar to Slowbro in which a Shellder attaches to Slowpoke and makes it bipedal but otherwise changes very little.
 * While Silvally is a mechanical creature with Memory Discs and a disc reader system its official descriptions mention cells, implying that Silvally is composed partly of organic tissues and partly of cybernetic parts, making it a cyborg.
 * Silvally was officially confirmed to be a Legendary Pokémon on October 16, 2017. Whether it's pre-evolved form Type: Null is also considered Legendary remains uncertain however.
 * Silvally is the only formerly non-legendary Pokémon to acquire the legendary status.

Origin
Silvally is based on a chimera. It also incorporates elements of cyborgs as well as gryphons and heraldic eagles. The bolts on either side of its head may be a reference to Frankenstein's Monster, while the shape of its crest may also draw inspiration from a cockatoo.

Etymology
Silvally comes from "silver" and "ally".