Originally Posted by Fat TM13IceBeam
Compoundeyes Sleep Powder is excellent utility and can incapacitate foes for free switches. It's not big, but it's helpful.
Butterfree has always been stupidly good with Compoundeyes. Tons of Nuzlockers use Butterfree in Gen 3 onward simply because it's the best pseudo-Psychic type out there, with that super yummy 98% accuracy Sleep Powder letting you just wail on the foe. I use it all the time thanks to it just trashing things that would normally bother it. Granted, it's not taking out the Dragonites on its own, but geez, Butterfree is a lot better than just "Compoundeyes Sleep and switch out"
I remember being seriously bummed that I couldn't get a Butterfree until post-game in B2/W2, because it would have been insta-teamed. Easily Mid-Tier, maybe even low-high.