Is this a good pokemon white team?

You may want to consider replacing kyurem or zekrom with another type of pokemon because they both have the same strengths and weakness. Adding a flying type pokemon to your team would be a good way to balance your team. Also I would consider replacing tterrakion because cobalion is part fight type. Maybe you may want to replace it with a water type because volcarona is part fire type. For kyurem ice beam or blizzard would be moves to consider. For zekrom dragon claw, dragon plause, or dragon breath. Combinding those moves with dragon dance would help greatly.