That's a question that's got a bit of a complex answer.
There are several archetypes considered "Tier 1" decks, and several more are "borderline" decks that are pretty good but not quite "Tier 1" material. Three I can think of:
Zekrom decks
Reshiram decks
Yanmega decks
And there are several sub-types of these decks, all of which require a level of detail I do not have the energy to go into detail about at 3 AM my local time.