The type checker is wrong when you pick use gen 2-5 type chart.

Question

All of the pure Fairy-types from Gen 5 and before are still considered Fairy-types in the coverage checker if you use the Gen 2-5 type chart, even though they used to be pure Normal-types. Also, gen 6 and after pokemon didnt exist yet so they should not be there and some pokemon got type changes in gen 6 and after so they need to be their previos typing.Please fix.

Comments

Right, changing them to act as Normal-type in the Type Coverage Checker in G2-5. So, they would be weak to Fighting.

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This might count as a duplicate of https://pokemondb.net/pokebase/meta/62122/suggestion-dont-include-pokemon-changes-coverage-checker

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Well, they used to be weak to Fighting- before Fairy- type existed.