Question

What is the Effectiveness of using a Psychic type attack on a Dark type after using Miracle Eye?

Answer 1

Effect

Miracle Eye removes a Dark-type Pokémon's immunity to Psychic-type attacks and restores the target's Evasion stat to normal.

From Bulbapedia

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So, Miracle eye would do regular damage on pure Dark types because it removes the immunity so it would not make sense to leave a resistance. Though if the Pokemon is a duel type and the other type has a resistance to Psychic (like Bisharp) then it would be not very effective. Also if the the Pokemon is a duel type and the other type has a weakness to Psychic (like Scrafty) then it would be super-effective.

Comments

Just wanted to give a sure answer as the previous one was rather confusing and does not appear to be 100% sure.

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What's your source? I don't doubt your answer, but some people would still like you to name a source.

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Bulbapedia, and logical deduction based on commonly known facts about similar moves and statuses.

Answer 2

Still Nothing, I think. Mircle eye does not get rid of resistance.

EDIT: I think It is Regularly effective.