PokéBase - Pokémon Q&A
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Lets see here. Arceus's Multitype changes it's type to the held plate, in this case, Electric. Thunderbolt is an Electric type move, and Arceus's type and Thunderbolt's type match up.

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Yes, Arceus would gain STAB if it has the Zap Plate and uses Thunderbolt.

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Although you wouldn't want to use Thunderbolt.