Eather it is kyurem(dragon-ice), or stunfisk(it may not look like it, but stunfisk is ground- electric) :)
Actually, it is kyruem. He can use the powers of reshiram and zekrom, thus becoming Black Kyruem (zekrom/kyruem) and White Kyruem (reshiram/kyruem).
black kyurem in black2
That depends on your definition of powerful.
According to Pokemon Black and White, its most powerful move is Double-Edge.
The most powerful dragon move is roar of time which can only be learned by dialga. otherwise it's Draco meteor
i believe its Victini's V-create which has a damage of 180
Arceus
Caterpie
Arceus is the most powerful, with a base stat total of 720, the current highest. sds ooo
The most powerful water type is Suicune.
The strongest (most powerful) Pokemon is of course rayquaza.
Kyogre.
dragonite