Is this a good combination or not. I think so cuz you get one free turn to focus and you can make huge damage in your next turn.
If you use focus energy one turn then the next focus punch I think you shouldn't have to do the one turn delay thing just like Solarbeam\Sunny Day.
It's a good combo, but I like Spore + Focus Punch even better. Breloom is just awesome. And if you like you can subseed with him aswell, but imo that's a waste of slots were you could have had Mach Punch/Sky Uppercut/Stone Edge/Seed Bomb.