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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.
Spore is the only 100% accurate sleep inducing move in the game. With the new sleep mechanics in Black and White, Spore can be used to devastating effect, incapacitating your opponent and buying you time to either set up a Substitute or a stat boost. Breloom is arguably the best user, typically using Substitute while the opponent switches fearing a Spore, almost guaranteeing that Breloom will pull off a Spore. Smeargle is also a viable user; it can outspeed common slow walls and put them to sleep, allowing it to pull off several stat boosts and Baton Pass them to a teammate.
Sing is a less accurate Normal-type equivalent.
Hypnosis is a less accurate Psychic-type equivalent.
Sleep Powder is a less accurate Grass-type equivalent.
GrassWhistle is a less accurate Grass-type equivalent.
Dark Void is a less accurate Dark-type equivalent that hits both Pokemon in double battles.
Lovely Kiss is a less accurate Normal-type equivalent.