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(hex:78) is a glitch item in Pokémon Yellow and an unterminated name glitch item.
Using this glitch item outside of battle with a 0x50 sub-tile early on the screen may place the player in a Glitch City that is visible after the menu is closed. This Glitch City can be cleared with the glitch item 9F (hex:5E).
Using this glitch item in battle with a 0x50 sub-tile early on the screen may corrupt the user's and opponent's sprites. However it is currently not known how to do this without arbitrary code execution (as normally opening the menu and using ₽ ぅ in battle causes the game to freeze).
Despite this, if a partial escape glitch item like -g m (hex:6A) is used then it is possible to cause a similar effect where the player can corrupt graphics on the overworld.