ゥ' B is a dual-type Glitch/Normalglitch Pokémon found in Pokémon Yellow. It occupies hexadecimal slot DB and will become Glitch (DB) if traded to Red and Blue. ゥ' B's front sprite will eventually crash the game. It shares the same sprite, and thus also this trait with two other glitch Pokémon, 4 4 and 8B 4 8. Its cry is the nudge of a moving Poké Ball.
ゥ' B has a glitch screen, particularly the black box variant. This glitch screen blocks ゥ' B's back sprite, as well as the battle menu from view when it is used in battle by the player.
ゥ' B's name is long and spans over the length of a row of text, which results in additional button presses every time its name is viewed, as well as various graphical issues, such as visually replacing moves in its summary. This can be confused with viewing the name of a Super Glitch move (which ゥ' B learns starting from level 33), but is harmless. These name issues can be avoided by renaming ゥ' B.