Park Ball glitch

Miscellaneous glitches of Pokémon Gold and Silver and Pokémon Crystal

Battle transition oversight | Change player color glitch (Crystal only) | Daylight Saving Time exploit | Get all three starters (Generation II) | Glitch Unown | Glitch dolls | Horn Drill and Fissure glitch | Unused and redundant Egg moves

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The Park Ball glitch, also known as the Park Ball battle mode graphics corruption glitch is a glitch in Pokémon Gold, Silver and Crystal.

The Pokémon capture animation while on the items menu

It is not a natural glitch, as another glitch such as arbitrary code execution or the bad clone glitch is required to obtain a Park Ball in the player's inventory, outside of the Bug-Catching Contest.

Summary

Using the Park Ball outside of the Bug-Catching Contest will activate the ball animation without closing the items menu. This causes the graphics to become glitched, and a glitch Pokémon sprite can momentarily be seen.

If the Pokémon breaks free, the colors may glitch out momentarily before returning to the main battle screen.