I once had a Breloom solo a Zard Y (he missed Fire Blast), a Banded Dragonite, and some other Pokémon. It was a defensive SubSeed set. Wish I had the screencaps still.
I had another time when my SD Breloom was my last Pokémon and my opponent sends out their Togekiss. I spore it. SD up, but alas, the Togekiss gets a first turn wake and hits me with that dreaded 4x supereffective Air Slash... not. It missed. Fuckin ninety percent accuracy. Put that fucker right back to sleep, SD twice more as he stayed dormant, annihilated it with a +6 LO Technician Bullet Seed. The rest of their team was Mega Sableye, Slowbro, and some other bulky stuff. Glorious.
I love Breloom.