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Based on the PvP match data, the best Pokemon for Fossil Cup are Registeel, Kartana, and Ferrothorn.
Source: https://gamerant.com/pokemon-go-fossil-cup-guide-rules-best-teams-tips/
Registeel definitely fills its role the best of the trio, as Steel is an amazing type, and having the best of both worlds makes it very flexible.
Source: https://gamerant.com/pokemon-ruby-sapphire-strongest-based-stats/