The Pokémon's insomnia prevents it from falling asleep.
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.
Pokémon with this ability (24)
#096
Drowzee
#097
Hypno
#163
Hoothoot
#164
Noctowl
#167
Spinarak
#168
Ariados
#198
Murkrow
#225
Delibird
#353
Shuppet
#354
Banette
#430
Honchkrow
#710
Pumpkaboo
#711
Gourgeist
#917
Tarountula
#918
Spidops
#951
Capsakid
#952
Scovillain
#710
Pumpkaboo
Small
#710
Pumpkaboo
Large
#710
Pumpkaboo
Super
#711
Gourgeist
Small
#711
Gourgeist
Large
#711
Gourgeist
Super
#150
Mewtwo
Mega Y