Bulbasaur learns it at level 41.
(Ivysaur learns it at 46 and Venusaur learns it at 55)
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Bayleef Does Not Learn Sleep Powder in HeartGold/SoulSilver
Butterfree learns sleep powder at level 15.
Shroomish doesn't learn Sleep Powder.
sleep powder catch a butter free and level it up afew times then it will try to learn sleep powder
lv. 15.