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Donphan solo guide needs updating.
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Most of the raid guides, even Machamp's, hasn't been updated in a while.
But as for donphan, you're going off outdated info. It hasn't been out for raids in several months, so roserade, HC gatr and Mamoswine didnt exist back then, as well as the effectiveness change, defensive rebalance and recent raid HP buff haven't been factored in and updated as such. Many other raid guides, and even pokemon pages haven't been updated with new information.