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It also cannot evolve into Raichu and is unaffected by the Eviolite. Cosplay Pikachu is affected by the Light Ball like every other Pikachu.
-Bulbapedia

Yes, a light ball would work because Cosplay Pikachu is still a Pikachu, just special. Eviolite does not work though, since it cannot evolve, even though it is still a Pikachu.
So put a light ball on Cosplay Pikachu instead :)
Source where you can find out more.

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Okay thanks! Luckily you included a reliable source.