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{{Error traps}}
{{Summary page}}
{{Bulbapedia}}
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[[Image:Badegg_battlegeniii.png|270px|thumb|right|A [[glitch Pokémon]] with an invalid checksum after being labelled as a "Bad EGG" in Pokémon Ruby and Sapphire.]]
 
"'''Bad EGGs'''" (Japanese: ダメタマゴ), as they are known in the [[bp:Generation III|Generation III]] Pokémon games and later "'''Bad Egg'''" in the [[bp:Generation IV|Generation IV]] games are error handlers.
 
==In Generation III==
In Generation III, they appear for Pokémon that do not have a correct checksum value (which is stored in its own byte). The checksum is computed by adding all unencrypted values of the 'data' section of the [[bp:Pokémon data structure in Generation III|Pokémon data structure]] one [[word]] (two bytes) at a time. If the actual checksum does not match the checksum value, the Pokémon will be interpreted as a Bad EGG, and if a hex:0000 [[??????????]] was interpreted as a Bad EGG, it will appear as a Bad EGG with an invisible icon.
 
Simply changing the personality value of a Pokémon rather than its [[bp:Pokémon data substructures in Generation III|data]] substructures can also turn Pokémon into Bad EGGs, probably due to the substructure order being changed due to a different modulo value. For this reason, it is possible to obtain Bad EGGs without cheating in Pokémon Emerald and Pokémon FireRed and LeafGreen using the [[GenerationPomeg IIIdata bit setcorruption glitch]].
 
Like ordinary Eggs, Bad EGGs in Generation III under normal circumstances can never be released, however, they can be released with the [[inverse cloning glitch]]. When the player attempts to view a Bad EGG's summary screen the game will not give the details of the Pokémon inside but rather, the game will bring up an 'Egg' summary screen, showing its 'state' (an indicator of how long it'll take to hatch the Egg) and 'trainer memo' (origin).
 
Regardless of what the trainer memo says, a Bad EGG will never hatch; only a normal Egg can hatch. {{fact}}
 
A Bad Egg may also be seen during {{RS}}'s version of the [[switch glitch (Generation III)|switch glitch]] or be caught with the [[roaming Pokémon encounter glitch]].
Though the validity of this happening without cheats is unknown, there is also [https://www.youtube.com/watch?v=fqbG7YitDhw a report of another Bad Egg glitch in FireRed/LeafGreen].
 
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==In non handheld Pokémon games==
Bad Eggs appear in Pokémon Battle Revolution.
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A [[glitch Pokémon]] in {{DP}} with an [[identifier|index number]] of 495 (hex:1EF), known as "Bad Egg".
 
"Bad Egg" is also mentioned in the [[trapping Ability flee glitch]] in {{Platinum}} if the player attempts to flee when the right side wild Pokémon has fainted (requires a Steel-type Pokémon on the user's side for Magnet Pull to prevent fleeing).
 
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==In Generation V==
Bad Eggs can be found in [[bp:Generation V|Generation V]].
 
==In Generation VI==
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They are not to be confused with '[[Mystery Egg glitch|mystery Eggs]]' (they are not actually called this, they are just referred to as Eggs). Mystery Eggs marked as originating from the Mystery Zone have appeared in the PC boxes of some players of Pokémon X and Y. They also have an obtained date of '0/0/2000'.
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[[Category:Generation III glitch Pokémon]]
[[Category:Generation IV glitch Pokémon]]
[[Category:Generation V glitch Pokémon]]
[[Category:Generation VI glitch Pokémon]]
[[Category:Glitch Pokémon]]
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