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Move types which are good on {{{1}}}: Dark², Ghost, Ground, Psychic
Move types which are bad on {{{1}}}: Fighting${}^4$, Grass
Move types which are very bad on {{{1}}}: Bug², Poison
Move types which don't effect {{{1}}}:³ Fighting, Normal

All other move types are normal effectiveness on {{{1}}}.

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³ - This immunity can be eliminated if the attacking Pokemon uses Foresight or Odor Sleuth on {{{1}}}; switching either Pokemon ends this effect (Not in Red/Blue/Yellow).

${}^4$ - If the immunity was removed by Foresight/Odor Sleuth (Not available in Red/Blue/Yellow).