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Puts the target to sleep. Pokemon protected by Magic Coat or the ability Magic Bounce are unaffected and instead use this move themselves. Pokemon with the abilities Insomnia or Vital Spirit are immune. Pokemon with the ability Soundproof are immune.
Sing has little competitive use. While the sleep status is powerful, Sing's accuracy is awful, and too unreliable in most situations. However, there are times when the risk of missing with Sing is worth it. The best example is with an extremely bulky Pokemon like Blissey; Blissey forces nearly every special attacker out, meaning Blissey will have a lot of chances to hit the incoming Pokemon with Sing and usually permanently cripple it thanks to BW's sleep mechanics.
GrassWhistle is a Grass-type equivalent.
Hypnosis is a 60% accurate Psychic-type equivalent.
Lovely Kiss is a 75% accurate Normal-type equivalent.
Sleep Powder is a 75% accurate Grass-type equivalent.
Dark Void is an 80% accurate Dark-type equivalent.
Spore is a 100% accurate Grass-type equivalent.