Nightmare

ghost status

Target loses 1/4 its max HP every turn as long as it’s asleep.

Stats

PowerNone (status move)
Accuracy100%
PP15
Priority0
Categorystatus
Targetselected pokemon
Can inflictnightmare
IntroducedGeneration II

In game description

This move can’t be used. It’s recommended that this move is forgotten. Once forgotten, this move can’t be remembered.

Pokemon that learn Nightmare

Showing the first 40. Availability varies by server, since some restrict move tutors or TMs.

Using Nightmare in Cobblemon

Nightmare deals no damage, so its value is entirely in what it sets up. Status moves are usually the difference in a close gym fight, and sleep or paralysis also make a wild Pokemon far easier to catch.

Check the type chart before relying on it, and look up specific targets in the Pokedex where dual-type multipliers are already worked out.