I've gotten lots of utility from Breloom. Hard to use early game but very useful in mid and great at cleaning up. Access to spore, colorful movepool and two great abilities allow it to be rather unpredictable and makes it fit on a lot. Genuinely think it's kinda underrated right now, but I am prolly too low on ladder to really knowOn the topic of breloom, I have tried SD, Poison Heal, I even tried Sub and Focus Punch, honestly, Breloom the biggest weakness are the ghost spam, but with those gone, breloom can totally go, its not a bad mon in the slightest
In terms of core, I like pairing it up with specs Pult but I don't know if that's optimal. I just think the typings synergize well