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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Nightmare glitch is a glitch that only exists in Pokémon Ruby and Sapphire versions. It has been fixed in Firered and Leafgreen versions, probably because because the move Nightmare is inaccessible without trading or the Battle Tower. If a sleeping Pokémon under Nightmare effects has his sleep status cured by the ability Shed Skin, the Nightmare effects will remain until the Pokémon faints or is switched out.

Requirements

1. A Pokémon knowing Nightmare.
2. A sleep-inducing move (preferably in same Pokémon with the move Nightmare).
3. An enemy with the ability Shed Skin.

Method

1. Enter a battle against a Pokémon with the ability Shed Skin (like the Silcoon/Cascoon in Petalburg Woods.
2. But the Pokémon to sleep, and use Nighmare.
3. Repeat the previous process until the Pokémon is awoken by Shed Skin under Nightmare effects.

It is still unknown what happens if this glitch is tried to be triggered into a Link battle between Ruby/Sapphire and other newer Gen III game.

External links

• Youtube Video by NaiJPC