I apologize if this set was posted earlier, but if not, I just want to remind you guys of this forgotten monster:

Breloom @ Toxic Orb
Trait: Poison Heal
EVs: 12 HP / 244 Atk / 252 Spd
Adamant Nature
- Substitute
- Focus Punch
- Seed Bomb
- Spore
Ever since Technician came out, I hardly ever see this set ever being used anymore, and I honestly I don't know why. Although priority Mach Punch is a great weapon against a lot of the OU meta game, none of his sets match the power of this sets Focus Punch. Once a Sub is up, it's a 6-5 match up because something is going to be put to sleep. Now, something has to switch into a Focus Punch, or sack the sleeper. With this strategy, Breloom guarantees 2 Focus Punches on whatever has come into counter or check it, making some surprising 2HKOs. Seed Bomb is for Jellicent, Gastrodon, and Keldeo.
Although Breloom loses out on revenge killing, he acts more as an insane wall breaker that can tear teams apart. The only efficient Pokemon that can counter Breloom, are Latias, Latios, Gengar, and Reuniclus. However, even the Psychic types still don't like taking a Focus Punch, and risk getting Spored anyway.
Anyways, I use this on my team, and I have found that it is much more effective in this meta game than some think, and if given the opportunity to set up a Substitute and with the proper team support, this thing can be a game changer. Very underrated, very dangerous, very effective.