You should save it for later to catch Latios.
Catch Groudon.
keep it if your playing Pokemon Sapphire for the rare kyogre.
you get a master ball from someone. use it. he's AWESOME!save your master ball for latios use an ultra ball to catch groudon that's what i did and it worked
Not unless you trade it. Sorry.
weaken it, make it sleep and use many ultra balls it will work eventually.
I would use a dusk ball.
You get the master ball in the aqua Hideout
There is no ruby in groudon.
you can only get groudon on Pokemon ruby.
go to cave of origin with a master/99ulta balls,use flash and get to the last chamber and groudon will appear
if you have saved the MASTER BALL when you received earlier in the game - all you do is throw it at him you don't even have to FIGHT him BUT I WOULD SAVE THE GAME BEFORE DOING THIS
A master ball can catch any wild pokemon.