Out of bounds Glitch City (Generation I)

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	Reason given: Further details about how these work.

Data from the first party Pokémon's nickname at y=E3, x=0A

An out of bounds Glitch City in Pokémon Red, Blue, and Yellow is a type of Glitch City that appears when the y coordinate of a map is a certain value higher than its y boundary. It is not to be confused with a Generation II out of bounds Glitch City.

It can be contrasted with a phantom city; which is a copy of a map that appears for excessively high x positions greater than the x boundary.

The required y coordinate for an out of bounds Glitch City may vary^{[clarification needed]}.

Parts of the game's memory may be rendered as map blocks in an out of bounds Glitch City, where data corresponds with the index number of a 4×4 tile block on the map.

This makes out of bounds Glitch Cities potentially useful for CoolTrainer mutation or "LOL glitch".

Accessing an out of bounds Glitch City

• Use a free travel walk through walls glitch.
• Go to either the north-west most or north-east most corner of a map (where y=00), then walk west or east. Alternatively, the glitch may work when y ranges between 01-06, with 06 placing you at position FE, 05 placing you at position FD, etc.
• The y coordinate will be corrupted. Keep walking up to see a Glitch City.

With cheats

Use the GameShark code 01FE61D3 (Red/Blue) or 01FE60D3 (Yellow), disable it, then keep walking up to see a Glitch City.

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