If the holder is infatuated, it will consume its Eggant Berry and cure its infatuation.
An Eggant Berry cannot be stolen by Thief or Covet, or exchanged by Trick.
The player will not be permitted to enter the Pokémon Cable Club Trade Center if a Pokémon in their party is holding this Berry. A Pokémon holding this Berry cannot be traded to Pokémon Colosseum or Pokémon XD: Gale of Darkness, nor can it be stored in the Western versions of Pokémon Box Ruby & Sapphire.
Petalburg Gym (from Norman after scanning the Eggant Berry e-Reader card; repeatable if the card is scanned again and the player has no e-Reader Berries in the Bag or PC when talking to him) Transformation from a different e-Reader Berry after scanning the Eggant Berry e-Reader card
The Mental Herb, also introduced in Generation III, has a similar effect to the Eggant Berry - but is unaffected by Berry-affecting moves and abilities, such as Pluck and Unnerve. As a result, the Eggant Berry was already largely redundant when it was introduced.