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Nightmare glitch
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Miscellaneous glitches of Pokémon Ruby and Sapphire, Pokémon FireRed and LeafGreen and Pokémon Emerald

PokéMart worker glitch (Emerald) | Dark Red Selector (Ruby and Sapphire) | Pokédex Species Glitch (FireRed/LeafGreen) | Azurill gender glitch (Recurring) | Berry glitch (Ruby and Sapphire) | Sticky Hold glitch (Ruby and Sapphire) | Surf on land (Ruby and Sapphire) (Japan only) | Thunderbolt glitch (Various) | Dewford Gym footprint glitch (Ruby/Sapphire/Emerald) | Draining hitpoints animation glitch (Ruby and Sapphire) | Amazing Trainers (Ruby and Sapphire) | Roaming Pokémon individual values issue (Various) | Roaming Pokémon Roar glitch (FireRed and LeafGreen) | Focus Punch glitch (Various) | Mail and Trick glitches (Ruby/Sapphire - JPN) | Mossdeep City Skitty glitch (Ruby/Sapphire) | Sky Pillar glitch (Ruby/Sapphire/Emerald) | Truck glitch (Ruby and Sapphire) | Nightmare glitch (Ruby and Sapphire)

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An awake Silcoon affected by Nightmare

The Nightmare glitch is a glitch in Pokémon Ruby and Sapphire. If a sleeping Pokémon under the effect of Nightmare has its sleep status cured by the ability Shed Skin, the Nightmare effects will remain until the Pokémon faints.

If the Pokémon is put to sleep again and is awakened thanks to Shed Skin, the glitch will persist, but if the Pokémon is put to sleep again and wakes up without Shed Skin, the Nightmare effects will go away.

It was fixed in Pokémon FireRed and LeafGreen, where Pokémon with Hypnosis and Nightmare are available without trading. It was also fixed in Pokémon Emerald.


  1. A Pokémon knowing Nightmare and a sleep inducing move.
  2. An enemy with the ability Shed Skin.


  1. Go to Petalburg Woods and enter a battle against a Silcoon or Cascoon, which have the ability Shed Skin.
  2. Put the Pokémon to sleep, and use Nightmare.
  3. Keep doing the above steps until the Pokémon is awakened by Shed Skin under Nightmare effects.

It is still unknown if this glitch occurs in Link Battles between Ruby and Sapphire or Ruby/Sapphire and another, newer Generation III game.

External links

YouTube video by NaiJPC