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[[File:Bad egg.png|frame|A Bad Egg in the [[party]] in Generation III]]
A '''Bad Egg''' (Japanese: '''{{tt|ダメタマゴ|Dame Tamago}}''' ''Bad Egg'') is an {{wp|error handler}} in the [[core series|core]] and [[side series]] Pokémon games and [[Pokémon HOME]] for Pokémon with invalid data, most often because of a {{wp|checksum}} mismatch. Bad Eggs were introduced in [[Generation III]] under the name "Bad EGG", and have appeared in subsequent games under the name "Bad Egg" or "Egg". While they have the same appearance as and share some properties with a regular [[Pokémon Egg]], Bad Eggs behave differently in several ways.

The term "Bad Egg" is sometimes also used for [[glitch Pokémon]] species with the name "Egg" or "Bad Egg" that can appear from [[Generation IV]] onward, or the error handlers for Pokémon species and forms that are not coded into [[Pokémon Brilliant Diamond and Shining Pearl]]. However, unlike an actual Bad Egg that appears due to a failed checksum, these Pokémon can battle and be released like any other hatched Pokémon. Bad Eggs should also not be confused with regular Eggs in games where Eggs do not normally appear, and regular Eggs modified to display "Bad Egg" as a [[nickname]].