Rage Candy Bar
The Rage Candy Bar (Japanese: いかりまんじゅう Rage Manjū) is an item available only in Pokémon Gold, Silver, and Crystal. It costs $300 when bought and heals 20 HP when used on a Pokémon. The price and effect are the same as a standard Potion.
It is a local specialty of Mahogany Town, much like the Lava Cookie is of Lavaridge Town. Initially only available from a man who blocks the way to the Lake of Rage, it is sold out after the Red Gyarados has been taken care of. From here, they are unavailable until the player defeats Team Rocket for good at the Radio Tower, after which they are sold by the town's shop.
Though the item does not exist in the coding of the Generation III and Generation IV games, it is mentioned repeatedly. In Two Island in Pokémon FireRed and LeafGreen, it is said to be a favorite of Bruno of the Kanto Elite Four, who left the island disappointed when he found that the shop was sold out of them. Again in Pokémon Platinum, it is mentioned, however, it is sold out in the Veilstone Department Store basement, being a favorite of Professor Rowan's.
Each time it is mentioned, the spelling of the item's name is slightly different. In Generation II, it is spelled in all-caps with no spaces in the item list, as "RAGECANDYBAR". FireRed and LeafGreen add a space and capitalize normally, noting it as "Rage Candybar". Platinum, finally, puts spaces between all words as "Rage Candy Bar". It is unknown which style its name would take in Pokémon HeartGold and SoulSilver, if it is available as an item, as item names are no longer all-caps, however, the length of its name could pose a problem, making it required to be in CamelCase as "RageCandyBar". Like the SecretPotion, its true nature (and thus an oddity in translation) will be revealed by its in-bag sprite, as manjū look nothing like a candy bar.