if you saved before you battled him, turn off your ds/gba and then turn it back on.
if not, then youre screwed

u cant kill groudon he gose back to his deep sleep ps.a pkm faints not dies

wtf you are?! how dumb are you to defeat such a precious pokemon in this game? just save
the game before battling him... and don't you ever try using your master ball to
groudon... that ball must be used to latios... get it? sorry i just got carried away
groudon is one of my favorite pokemon... hoped i helped

save the game BEFORE you battle him. If you dont, jus t buy anoter gameboy and pokemon
ruby, save and catch him and save again and trade it.

Hello!? Is anybody / one there!?

If you have an Action Replay then you could/ can use a cheat to get it ( mabye as a fossil
. ) but I did on my DS on Pokemon Diamond and it wiped out EVERYTHING! AND! Ruined my DS
AND AR! but I've never used a Game shark before ( my oldest brother has one/ it ) .

before your gonna catch groudon save now battle it if groudon die restart the gba :-D

that sucks

Didn't anyone teache u that u have 2 save b/f fight a leginary poke???!!!!!

I made him die and i dindnt have the master ball and i dont want to start over

Even i got the same problem as him i did'nt know at that time so i just killed it and a
few days later i noticed that i can't catch it again!