in the cavo of oroginafter the "sunny spells" over hoeen
after you see groudon for the first time but only see it. i no this isn't very helpfull, but ask the question "How do i catch groudon in Pokemon ruby" or ask "Where and how to catch groudon in Pokemon ruby"
first go to the cave of origin in sootopolis, and go to the end, you will see groudon there
groudon
If you skipped up Groudon, you're screwed, he doesn't come back. Sorry :/
uxie groudon mesprite azelf and dialga
Once you defeat Groudon, you can't battle him again. It's either you catch him the first time or don't.
When you first complete steam cave
No, whatever myth you heard of Groudon evolving is false. Groudon does not evolve at any time.
after you get the red orb from mr.pokemon,go to the embedded tower,and you see groudon.
In a battle Groudon,would win you see groudon has 150 attack and 140 defense kyogre has 90 attack and 90 defense threfore groudon rules!
groudon is going upto train groudon easier you should put him in the front of you're party and bring him out to battle first and it would be even better to go and battle the Pokemon league, because there you will see high level Pokemon so you're groudon will gaen a lot of e.p. points.
In a battle Groudon,would win you see groudon has 150 attack and 140 defense kyogre has 90 attack and 90 defense threfore groudon rules!