If the holder's stats are lowered in battle, it will consume its Ginema Berry and raise the lowered stats.
A Ginema 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 Ginema 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 Ginema Berry e-Reader card
The White Herb, also introduced in Generation III, has a similar effect to the Ginema Berry. However, the White Herb completely resets a lowered stat while the Ginema Berry raises a stat that has been lowered.
Origin
The Ginema Berry's design and name may be based on a タマネギ (Tamanegi) (onion).