Lum Harvest Exeggutor is a complete stop to the core, can switch into spores, scalds like a boss and proceed to kill them with lead storm and psychic or sleep powder the switch in. Subsplit rotom-f is good for a speedy team since eggy get a pitful 55 speed. It can cleanly ohko ammongus and alomolola with stab blizzard and t-bolt. They are a good offensive core by itself, you only have to beware escavaliers and skuntanks, I just throw in a sub bu physical defensive poliwarth to counter them. I just threw them in my team to fuck stall up. When playing in any tiers, I just make sure I have some stall breakers that can break through the notable defensive cores in the tier. Hope this helped