You find him when you have beat the Pokemon league.You have to go to the weather instute near fortree town and talk to the man at the laptop on the top floor.Then you go to meteor falls but the weather has change and it does not look like meteor falls and groundon is there. I advise you to use a master ball that can be found at team aquas hideout.
In Pokemon Emerald, Groundon and Kyogre are legendary Pokemon. You can find them in the Marine Cave and the Terra Cave.
The three legendary Pokemon in Pokemon emerald is Kyorge, Groundon and Rayquazer.
Find rayquaza at the top of sky pillar.
yes trade from ruby *or Emerald
yes you do from Nathan mcphetres
nothing, but if you catched it you can train it
impossible only on ruby or emerald get emerald though 'cause it kick's a s s
kyorar and groundon then latios or latias te the reges
You have to send migrate it from Ruby, Sapphire, or Emerald Pokemon games to the pal park.
You would have to trade a groudon from ruby or emerald to colosseum to have one.
you can use master ball in caught the groudon
for me emerald because you can catch all Pokemon and you can find many shiny Pokemon i think emerald bec you can get almost all pokemon on it bec you can get the moon thing or susket but other than that ya emerald when you do get rayquaza kyogur and groundon they are lvl 70 all of them in pokemon sappire you oly get a lvl 45 kyogur (sorry for spelling)