It will take you home,but one day later you will go to Sky Tower.
By either beating them or catching them.
There are many legendary Pokemon in emerald, such as groudon, rayquaza, groudon, deoxys, and such. Groudon and Kyogre are not available until after beating Wallace, but Rayquaza can be caught right after the major battle between groudon and kyogre.
After beating the gym leader you will be asked to calm down groudon and kygre
You would have to get a groudon from someone else if you wanted one before you beat the game.
yes after beating the elite 4 you can catch both him and groudon.
You can't catch Groudon in Sapphire. Groudon is avaible only in Ruby and Emerald.
Go to professor Oak after beating the game and talking to the person right before the cave you get groudon.
You can get groudon or kyogre by getting lots of team points and you can get entei, raicou or sucuine by beating the tppc legend but beware he is ultra tough!
After beating Red, you can catch Groudon. If you have caught him and trade for a Kyogre you can also catch Reyquaza.
after beating elite four you wont to go in water institute. then go in 2 ft. talk to the guy. he say routes. when he say rout 114 you wont to go there and there is a new cave! go there and there is groudon.
find a friend with the kyogre obtained from heart gold and reenter the tower and go find raquazya
Beat all 16 gyms and talk to Professor Oak after beating the elite 4 twice + beat RED. You can't get the red orb. If you want a Groudon, you´ll have to trade it with somebody that has SoulSilver, or you can get Groudon with cheats.