Generation III Ability

Insomnia

Prevents sleep.

Insomnia Effect

This Pokémon cannot be asleep. This causes Rest to fail altogether. If a Pokémon is asleep and acquires this ability, it will immediately wake up; this includes when regaining a lost ability upon leaving battle. This ability functions identically to Vital Spirit in battle.

“The Pokémon's insomnia prevents it from falling asleep.”

Insomnia Data

Introduced
Generation III
Pokémon
17
In short
Prevents sleep.

Pokémon With Insomnia

17 Pokémon can have Insomnia.