Statistically, Groudon is essentially the mirror of Kyogre: it has 150 base Attack and 140 base Defense. What really makes this Pokemon an uphill battle to deal with, though, is the Drought ability.
are available via the games’ official website. They cover the two legendaries in the game—Kyogre and Groudon, along with their Primal forms—and aspects of the games’ story and characters as well.