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Puts the target to sleep.
Hypnosis has little competitive use. It's mainly used by lead Gengar to get the fastest sleep. It's very unreliable, but if you happen to put your opponent asleep, you will have a huge advantage in battle.
Sing is a Normal-type equivalent.
Sleep Powder is a more accurate equivalent.
Lovely Kiss is a more accurate Normal-type equivalent.
Spore is a much more accurate equivalent.