You need to beat the elite four then talk to the man on the computer at the Weather institute. He will tell you what route groudon's cave is on.
yes trade from ruby *or Emerald
You can't kyogre is specific to Sapphire and groundon is specific to ruby
No you cant you can only get it in ruby version.
You don't get Groundon on leaf green. Only in Pokemon Ruby version, if you want one ask a freind to trade for one.
You can only catch seedot, nuzleaf, shiftry, zangoose, and groundon in ruby.
Kyroge,Groundon,andRayquazza
The most powerfull Pokemon in Pokemon ruby i think is Groundon,SAphire Kyogre,Emerald RAyquasa??
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.
in the cave in sootoplis city when your going to fight groundon
U use it to awaken Groundon at the embedded tower;~]
after you catch or beat groundon he we be at the gym when you talk to the magma and aqua leaders