Thats the idea of building a team lol, centering a sweeper around a team so that it can sweep later! Xatu just insures that Ferrothorn, Ogres #1 enemy isn't trouble :P while screwing over any hopes the enemy has of getting hazards up. I can tell Ho-oh might be annoying to this team since it hits Ogre hard with BB (worse if it has a sub up D:) and can troll Ferrothorn with Sacred Fire so... I think we should use Earth Plate / Choice Band Groudon with speed creep. The reason why they have the items is so that they can also OHKO opposing Dialga + Zekrom, so Groudon also checks Dialga and Zekrom now (and Ho-oh since we re running Stone Edge right?), Zekrom and Sub Ho-oh is an Ogre issue and Dialga is killed if it tries to get Rocks up so it can't phaze our fully boosted Ogre.
This team can go semi-stall or balanced now with the decisions we've made so far. A bit random of a question but which way do you want to go?
EDIT: Your online wanna discuss this on IRC?