One of the 0x50 sub-tiles indicated in the blue square.
The 0x50 sub-tile is a sub-tile in Pokémon Red, Green, Blue, and Yellow with an index number of 80 (hex:50). A sub-tile is part of a tile of 4×4 parts, itself part of 4×4 tiles known as a tile block.
The sub-tile varies based on the tileset for the current map. For example, in Route 1 it is the bottom-left corner of a bush, while in Viridian Forest it is an 'up arrow'.
This sub-tile is needed for buffer overflow techniques that have the game attempt to copy saved screen data into another buffer until the first 0x50, such as CoolTrainer♀ move corruption and LOL glitch, and is usually saved on to a screen data copy that is updated every time the player opens the Pokémon or items menu (among some other menus).
Without the player having a 0x50 sub-tile on the screen data copy, it would likely cause the game to freeze during the corruption due to the game copying too much data.
List of 0x50 tiles
Battle (no Pokémon sent out)
Battle (Pokémon sent out). This tile varies based on the user's sprite.
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