Charge Beam additional effect chance glitch

The Charge Beam additional effect chance glitch is a glitch in the Generation V, VI, VII, and VIII core series games.

It first appeared in Pokémon Black and White and appeared in all subsequent core series games until Pokémon Sword and Shield, except Pokémon Let's Go, Pikachu! and Let's Go, Eevee!.

Effect

If the user has Serene Grace and uses Charge Beam while its side is under the effect of the rainbow from the combination of Fire Pledge and Water Pledge, the additional effect chance for Charge Beam will overflow and become 24%.[1]

Explanation

To multiply the additional effect chance due to the effects of both Serene Grace and the rainbow, a 16-bit signed integer is used. However, for moves that do not inflict status conditions, the additional effect chance is then stored in an 8-bit unsigned integer.   is greater than 255 (the maximum value for 8-bit integers); it subsequently becomes 24% when assigned to an 8-bit integer (when the most significant bits are truncated):  .

This glitch would affect all moves with a base additional effect chance between 64% and 88%. However, Charge Beam is the only move with an additional effect chance within that range.

Improper truncation still occurs for moves with an additional effect chance greater than 88%, but has no noticeable effect. Icy Wind, for example, has an additional effect chance of 100%, which will become  , which is set to 100 (just like the correct value of 400 would have).

This glitch is not present for moves that can inflict status conditions, as that percentage is consistently stored in 16-bit integers. Flinching is not affected either, as the Serene Grace and rainbow multipliers do not stack for flinching.

External links

By パデック
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Main
Multiple
generations
:
Transform glitchesGlitch TrainersCloning glitchesError messagesArbitrary code execution
Generation I: --0 ERRORBroken hidden itemsCable Club escape glitchExperience underflow glitch
Fight Safari Zone Pokémon trickGlitch CityItem duplication glitchItem underflowMew glitch
Old man glitchPewter Gym skip glitchPokémon merge glitchRhydon glitch
Select glitches (dokokashira door glitch, second type glitch) • Super GlitchTime Capsule exploitZZAZZ glitch
Generation II: Bug-Catching Contest glitchCelebi Egg glitchCoin Case glitchesExperience underflow glitch
Glitch dimensionGlitch EggTeru-samaTime Capsule exploitTrainer House glitchesGS Ball mail glitch
Generation III: Berry glitchDive glitchPomeg glitchGlitzer Popping
Generation IV: Acid rainGTS glitchesPomeg glitch
Surf glitchTweakingPal Park Retire glitch
Generation V: Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Frozen Zoroark glitchSky Drop glitch
Generation VI: Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Lumiose City save glitchSymbiosis Eject Button glitchToxic sure-hit glitch
Generation VII: Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Toxic sure-hit glitchRollout storage glitch
Generation VIII: Charge Beam additional effect chance glitchCharge move replacement glitchChoice item lock glitch
Toxic sure-hit glitchRollout storage glitchParty item offset glitch
Glitch effects: Game freezeGlitch battleGlitch song
Gen I only: Glitch screenTMTRAINER effectInverted sprites
Gen II only: Glitch dimension
Lists: Glitches (Gen IGen IIGen IIIGen IVGen VGen VIGen VIIGen VIIIMystery DungeonGOTCG GBSpin-off)
Glitch Pokémon (Gen IGen IIGen IIIGen IVGen VGen VIGen VIIGen VIII)
Glitch moves (Gen I) • Glitch types (Gen IGen II)