no Groudon is not...first you need to beat the Elite Four and then go to the Weather Institute and talk with the guy on the top floor and he'll tell you there is either extreme rain or extreme drought on a particular route.Go to the route with extreme rain(sorry cant specify theres multiple places it can appear)and look for a new place to dive that wasn't there before and Dive to find a Kyogre,Groudon is found a similar way except that the guy tells you theres a huge drought on some route,go there to the route he tells you and you should find a cave that didn't use to be there.Enter the cave to fin d Groudon
hope I helped!If you got any other questions...just ask me I know almost everything about the game except what to tell that damned sad girl to make her smile!
~Engel der Bosheit
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