These glitches occur in Pokémon Gold and Silver when data for the Trainer at Viridian City's Trainer House becomes corrupted. A Trainer House glitch will either cause the game to freeze before fighting a Trainer House Trainer or enable a battle with a glitch Trainer.
They are often accompanied by Mailbox glitches, a delivery man appearing in Pokémon Centers and/or the Mystery Gift option becoming available on the menu without having to talk to the girl in green on Goldenrod City Department Store's fifth floor.
The glitch can be activated by viewing certain glitch Unown in the Pokédex, which are available through ????? party overloading or arbitrary code execution (e.g. via the Coin Case glitch).
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