Info on the move Yawn

Yawn

Move data

Type	normal
Category	Status
Power	0
Accuracy	—
PP	10
Introduced	Generation 3

Yawn makes the target drowsy on the turn it is used. If the target is still on the field at the end of the next turn, it falls asleep. Sleeping Pokémon cannot move (with some exceptions such as Snore). Sleep lasts for 1-3 turns.

Pokémon with the abilities Insomnia or Vital Spirit, or those behind a Substitute cannot be put to sleep.

When a Pokémon is holding Normalium Z and uses its Z-Power, Yawn turns into Z-Yawn and raises Speed one stage, in addition to its usual effect as above.

Game descriptions

Ruby Sapphire Emerald	Lulls the foe into yawning, then sleeping next turn.
FireRed LeafGreen	A huge yawn lulls the foe into falling asleep on the next turn.
Diamond Pearl Platinum HeartGold SoulSilver	The user lets loose a huge yawn that lulls the foe into falling asleep on the next turn.
Black White Black 2 White 2	The user lets loose a huge yawn that lulls the target into falling asleep on the next turn.
X Y O.Ruby A.Sapphire	The user lets loose a huge yawn that lulls the target into falling asleep on the next turn.
Sun Moon Ultra Sun Ultra Moon L.G. Pikachu L.G. Eevee	The user lets loose a huge yawn that lulls the target into falling asleep on the next turn.
Sword Shield B.Diamond S.Pearl	The user lets loose a huge yawn that lulls the target into falling asleep on the next turn.