Nightmare glitch

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

Exclusive to Ruby and Sapphire:
256x item selling price glitch | Amazing Trainers | Berry glitch | Draining hitpoints animation glitch | Evolution animation glitch | Sticky Hold glitch | Mossdeep City Skitty glitch | Truck glitch | Nightmare glitch | Mossdeep City Skitty glitch
Acro Bike instability glitches (Japanese only) | Dark red selector glitch (International only) | Excessive doll arrangement glitch (Japanese only) | Mail and Trick glitches (Japanese only) | Surf on land (Japanese only)

Exclusive to FireRed and LeafGreen:
Celadon City origin glitch | Pokédex species glitch | Roaming Pokémon Roar glitch

Exclusive to Emerald:
Battle Pike poison knockout glitch | Black curtains glitch | Mart worker glitch | Mover Vigoroth cry glitch (Japanese only)

In various or all entries:
Azurill gender glitch | Boss HP recruit glitch (Mystery Dungeon) | Decamark-specific glitches | Dewford Gym footprint glitch | Evolution move-learning glitch | Focus Punch glitch | Roaming Pokémon IV glitch | Sky Pillar glitch | Thunderbolt glitch | VBlank RNG interrupt glitch

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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.

Requirements

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

Method

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