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Once it finds a partner it trusts, Type: Null destroys its own control mask to become Silvally. It reverts to its wild temperament, but it will obey its Trainer and even risk its own life in its partner's defense. The destruction of its mask re-activates its RKS System, allowing it to change its type according to the Memory attached to it; its eyes, spikes, and fin membrane all change color to match its current type.

Silvally is the only known Pokémon capable of learning Multi-Attack.
Man: Type: Null Just smashed it's helmet apart
Trainer: No It's now a Silvally, no longer Null
by Miles Bonekeeper August 20, 2017
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