When it appears on the screen, it allows for the player to obtain Mew (whose index number is hex:15 or dec:21) using screen data related exploits like CoolTrainer♀ corruption and LOL glitch. Specifically for those glitches, the 0x15 sub-tile must be at BGB coordinates y=06 x=01 for obtaining Mew.
List of 0x15 tiles
Glitch Rocket HQ maps (Yellow)
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