>>49058112It can only fill one role, as a special wallbreaker (the strongest special wallbreaker there is, mind you) while Groudon is immensely versatile and can therefore fit into more teams
Not to mention that Groudon itself can switch into Kyogre anytime thanks to Desolate Land, but Primordial Sea does nothing to protect Kyogre from Ground-type moves
It's not as strong as Groudon or Rayquaza despite having similar stats, and likely isn't as strong as Zacian either