Silvally is a quadrupedal, chimeric Pokémon with traits from a variety of creatures, with an appearance nearly identical to its pre-Evolution, Type: Null, specifically in its lower body, legs, and general body shape; the clearest change is its head and fur, now liberated from the control mask that gave rise to its classification as Type: Null. Revealed due to the removal of the control mask, its mammalian head is visibly augmented with mechanical parts. Its blunt snout is metallic on the bridge of its nose and upper jaw. Silvally has a triangular black nose framed by three red lines, pointed ears with bright pink and black insides, one visible fang on each side of its lower jaw, and a slight overbite. Its eyes are bright silver, have no visible pupils, and appear to be surrounded by an empty, black space. On each side of its head is a circular, metallic drive, with a white circle crossed by a metal line. Removal of the control mask has caused its previous gray to become silver and the inside of its tail fin to become a pure white. On top of its head is a large, axe-like fur or feather crest. The forward-facing tip of the crest has a metallic piece that hooks downward, while the back has three white feathers now revealed due to the control mask's restraints no longer being present.
Once Type: Null finds a trusted partner and forms a strong bond with them, it gains the strength and willpower needed to destroy its control mask and finally evolve into its original form, Silvally. After its Evolution, it reactivates its RKS System, gaining the capacity to change its type through the memories created by the Aether Foundation; this power was based on those of a certain Pokémon depicted in myths. Additionally, Silvally's speed and senses are increased due to Evolution. It was created as part of the beast killer project as an "Anti-UB Fighting life-form", however, the project was deemed a failure and a control helmet was built to seal away its power, turning it into Type: Null. It reverts back to its natural, wild temperament, but it is still extremely loyal to its Trainer, and it will even risk its own life in its partner's defense.[1]Gladion was the one who coined Silvally's name, but when it was created, it was named as "Type: Full" due to its ability to change between all types. As seen in Pokémon the Series: Sun & Moon and Pokémon Adventures, Silvally can sense the appearance of Ultra Beasts and the opening of Ultra Wormholes, which fits its status as a Pokémon designed to counter them.
Silvally has eighteen different forms, one for each type.
Thanks to its RKS System, Silvally is capable of changing its form and type according to the memory attached to it; its eyes, spikes, drives, and fin membrane all change color to match its current type.
Silvally has multiple different forms that it switches between with its AbilityRKS System, with each of its forms having a different type. In total, it has eighteen different forms, one for each type. By default, Silvally is in its Normal-type form. If it holds a memory, it changes its form to be the same type as the type the memory corresponds to. In Generation VII, Silvally can only learn Draco Meteor while in its Dragon-type form; however, in Generation VIII, it can learn Draco Meteor regardless of its form.
Silvally's stat distribution is identical to its pre-Evolution, with the exception of its Speed stat rising to match its other stats.
The change in its Speed stat to 95 from 59 is a reversal of the digits.
This change to only its Speed stat makes Silvally's Evolution from Type: Null to experience the least changes to individual base stats of all Evolutions.
Silvally, like its pre-evolved form, seems to be based on a chimera, a hybrid composed of different animal parts, or more specifically a Griffin due to the wing-like crest on its head. Its concept also bears resemblance to Arceus, which can also change type and appearance based on the held item. Like its pre-Evolution, it also appears to be based on Frankenstein's monster due to the bolt-like objects on its face and it being created from cells of different Pokémon types.
Name origin
Silvally may be a combination of silver and ally.
Silvady may be a combination of silver and buddy.
Silvally's Pokédex entry in Pokémon Moon says that its name was given by the boy who evolved it, most likely Gladion. Silvally being Gladion's partner explains the presence of ally in its name.
This Pokémon article is part of Project Pokédex, a Bulbapedia project that aims to write comprehensive articles on each Pokémon species, as well as Pokémon groups and forms.