How can I teach Gengar a skill to make enemies fall asleep?

I'm trying to find a way to have my Gengar (both in Pokemon Sapphire Alpha or X) to learn a skill to make other Pokemon fall asleep.

Is there a way?

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What move can gengar learn to put PokÃ©mon to sleep?

Gengar Learns Hypnosis at Lv. 1. If you already have a levelled Gengar, go to the Move Relearner in either of the games to relearn Hypnosis.

Can gengar fall asleep?

The Pok\xe9mon cannot fall asleep.

What moves can make PokÃ©mon fall asleep?

Moves

Relic Song - Has a 10% chance of falling Asleep.
Secret Power - Has a 30% chance that causes Sleep in Tall Grass or Very Tall Grass.
Dark Void - Causes Sleep on contact.
GrassWhistle - Causes Sleep on contact.
Hypnosis - Causes Sleep on contact.
Lovely Kiss - Causes Sleep on contact.

Does hypnosis work on gengar?

Gengar might the only pokemon that can take advantage of hypnosis because of his speed and his ability to learn Dream Eater. Supported with DT and Sub, this Gengar can have a pretty solid defense. Once the opponent is asleep, Dream Eater works like Recover and at the same time it damages the opponent.

GENGAR’S HIDDEN MECHANIC \u0026 How to Use it Effectively | Pokemon Unite

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Images: Gustavo Fring, Kristina Paukshtite, Andrea Piacquadio, Monstera