Should you purify Shadow Regigigas in Pokemon GO?

Regigigas is making a comeback in Pokemon GO, and this time, it is available in Shadow form.

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Finally used my Shadow Radar! #pokemongo #pokemon #pokemoncards #pokem

𝙶𝚘𝚍𝚍𝚎𝚜𝚜 ❤︎ (@ItsGxddesss) / X

Should I purify or leave as shadow? It's my first Regigigas. I've never been too knowledgeable about benefits of Pure vs Shadow. : r/pokemongo

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