i personally think breloom is good by itself if u play fullmoon stadium withit. good bye darkrai lv.x and crecelia lv.x. blisscario if mag sw is your metagame though.
Breloom will definatly be a good Metabreaker. OHKO Darkrai, Honchkrow, Cresilia, Banette, Gardevoir (Lv.X w/1 PP), and Absol.
But Bliscaro definatly has speed. But LucaBroom will definatly be unexpected. Plus easier to get the cards.