Berry glitch

Miscellaneous glitches of Pokémon Ruby and Sapphire, Pokémon FireRed and LeafGreen and Pokémon Emerald

Exclusive to Ruby and Sapphire:
256x item selling price glitch | Amazing Trainers | Berry glitch | Draining hitpoints animation glitch | Evolution animation glitch | Sticky Hold glitch | Mossdeep City Skitty glitch | Truck glitch | Nightmare glitch | Mossdeep City Skitty glitch
Acro Bike instability glitches (Japanese only) | Dark red selector glitch (International only) | Excessive doll arrangement glitch (Japanese only) | Mail and Trick glitches (Japanese only) | Surf on land (Japanese only)

Exclusive to FireRed and LeafGreen:
Celadon City origin glitch | Pokédex species glitch | Roaming Pokémon Roar glitch

Exclusive to Emerald:
Battle Pike poison knockout glitch | Black curtains glitch | Mart worker glitch | Mover Vigoroth cry glitch (Japanese only)

In various or all entries:
Azurill gender glitch | Boss HP recruit glitch (Mystery Dungeon) | Decamark-specific glitches | Dewford Gym footprint glitch | Evolution move-learning glitch | Focus Punch glitch | Roaming Pokémon IV glitch | Sky Pillar glitch | Thunderbolt glitch | VBlank RNG interrupt glitch

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Bulbapedia also has an article about Berry glitch.

The Berry glitch is a misnomer for a glitch related to the internal clock in Pokémon Ruby and Sapphire, when all clock-based events will freeze, including the growth of berries. It was officially patched in later versions of the Generation III games so it does not exist in Pokémon Emerald. The glitch causes all berries to stop growing, and occurs after the game's internal clock has been active for a currently unknown amount of time (possibly around 194 days which corresponds to 16777215 (or FFFFFF seconds). This happens because in order for berry growth to occur while the game is not on, the internal clock has to control it, and when the internal battery runs dry, the internal clock stops.

Fixing it

This glitch was reported to Nintendo and as a result, they took action and released multiple fixes for the Berry glitch. It was probably acknowledged due to the fact that it hindered gameplay, rather than giving the player extra control over the game, and was not preventable. Below are a list of official fixes for the Berry glitch:

1. For a limited amount of time, Nintendo allowed players to send their games in, and receive them back with the Berry glitch fixed.
2. The Pokémon Colosseum Bonus Disc, which includes a Jirachi transferable to the handheld games and a trailer for the 6th Pokémon movie, also included the opportunity to connect the Game Boy Advance to the GameCube and have the Berry glitch fixed.
3. In Pokémon FireRed and LeafGreen, the player could press B + SELECT + Up at the title screen to reveal a screen titled "Berry Glitch Fix." From here, one could connect to a Pokémon Ruby or Sapphire game with a link cable and have the Berry glitch fixed.
4. Downloading Jirachi from Pokémon Channel will fix the Berry glitch after it has been transferred to the game.
5. When the player links an affected game to Pokémon Box, when the player saves their game in the 'Go To Adventure' mode the Berry glitch will have been automatically fixed, with the message "The Berry Program was updated".
6. In the Japanese versions of Pokémon Ruby and Sapphire, if the player uses the e-Reader cards for the Pokémon Scoop's Winter 2004 event the cards will also fix the Berry glitch.
7. In certain stores across the US and Japan, players could recieve a specifically marked demo disc containing a Shiny Zigzagoon and a fix to the Berry glitch.

Notes

• One can tell if this glitch happens if their game displays a message at the title screen saying that "The game's internal battery has gone dry."
• When this glitch happens, the clock in the player's room stops.