Focus Energy glitch

Miscellaneous glitches of Pokémon Red and Blue and Pokémon Yellow

Amazing Man (Red and Blue only) | Cable Club escape glitch | Celadon looping map trick | Champion Blue music muting glitch | Coastal Flooding | Confusion and Substitute glitch | Cooltrainer move | Cycling based glitch maps | Escape sprite handling glitch | Evolve without an evolutionary stone (Red and Blue only) | Evolving Raichu (Red and Blue only) | Expanded item pack | Expanded Pokédex | Focus Energy glitch | Get stuck in a wall | Ghost Bicycle glitch | Glitch encounter system | Glitch City RAM Manipulation | Infinite Blaine Door | Introduction Nidorino glitch (Red and Blue only) | Invisible PCs (Red and Blue only) | Invisible tree glitch | Item stack duplication glitch | Mute the music in the Pokémon League | Partial trapping move link battle glitch | Pokémon Tower Pokédex glitch | PP underflow glitches | Recovery move glitch | Rival's effect | See a Ghost without a Silph Scope | Selfdestruct and Substitute glitch | Silph Co. PC Glitch | Slot machine glitch | Stand on a tree | Statue behavior glitch (Red and Blue only) | Super effective move AI flaw (Red and Blue only) | Super Glitch | Surf down glitch | Swift miss glitch | Transform assumption glitch | Transform Empty Move Glitch | Trick Zone | Vending machine purchase glitch | Walk around with only fainted Pokémon (Red and Blue only) | Walking lag glitch | Walk on water through Surf | Walking Pikachu happiness glitch (Yellow only) | Wild appeared! | ZZAZZ Glitch

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The Focus Energy Glitch is a glitch in Pokémon Red and Blue Versions involving the effect of the move Focus Energy.

Focus Energy is a move that, ever since Generation II, increased the user's critical hit rate. This glitch, causing it to sometimes do the opposite, was fixed in Pokémon Stadium.

Focus Energy's original effect

After Focus Energy is used, any move that does not have an increased critical hit rate (Razor Leaf, Slash, Crabhammer, Karate Chop) will have one quarter of the normal chance to land a critical hit.

As for moves with increased critical hit rates, the reduction is dependent on the user's speed. If the user is faster than the opponent, no reduction occurs. If the user is somewhat slower than the opponent (exact numbers still need to be found,) then its critical hit rate will lower by 50%. If the user is significantly slower than the opponent, then it will become impossible for the user to land a critical hit.