All you have to do to get the sapphire in leaf green and fire red, is get the ruby. But first I'll tell you how to get the ruby.
Get the Ruby:
First, go to one island. Then, go to mt.ember. Then when you walk into Mt. Ember, go right. (You have to beat the elite four for this to work.) You will see two team rocket grunts, and before you can go up to them, you will suddenly stop. You'll hear them say something like this: "What were the rocket warehouse passwords again?" "What?! You forgot the passwords, already?! Well, ones 'Goldeen need log', and the other one is..." "Hey! That kid has been snooping up on us all that time!" Then go up to them, and battle both. then they'll teleport away. Then go into the cave they dug. When you get to the two way part, go down. Get through all the 'strength' mazes, and get the ruby. Then go to the Pokemon one island center, and give Celio the ruby. (He asked you before if you could get the ruby, if you went there.) Then he'll say "thank you', and he'll give you a rainbow pass. The rainbow pass let's you go to the sevii islands.
Get the Sapphire:
Go go to the six island, and go to the dotted hole. (Just check on the map Celio gave you.) The braille on the front door says, "cut". It doesn't look like that, but look on your braille chart you got with the pack of the game. So, use cut, and the door will open. Fall through the hole in the middle of the room, and read and follow all the braille tablets in each room. Then when you press 'A' on the sapphire, a 'Super Nerd' will come in. He takes the sapphire before you do, and tells you the second password for the werehouse. Then go to the five island, and go to 'Five island meadow'. Beat all the rocket grunts there, and get through the warehouse. I'm sorry I don't know how to get past the werehouse, but my sister does. Then when you get through the werehouse, you'll see that Super Nerd again. Battle him and win. Then he'll give you the sapphire.
Note: When you get the Ruby, above on the wall in braille, it says to put both gems on the ruby tablet. The only way to do that is trading. You get two Gameboys, and two games, and don't give the sapphire you just got to Celio. That'll ruin it. Make sure the other game has not given the ruby to Celio. Trade the sapphire into the other game, and put them both on the tablet. I don't know what will happen, because I think I'm getting Fire red for Christmas. Then the next day I'm seeing someone with a gameboy. Then I'll see what happens, and I'll tell everybody who can't do this for some reason.
P.S. You also have to do the competition in the Ice fall cave for this to work.
I am a different person but i am trying to figure out What do you do next but i know how to catch mewtwo go to cerulean cave go on the nuget brige take a left you see water surf follow it until you find land go on it find the opening surf again till you find the last thing with a ladder go in it then your half way there go in a laddersurf until you find mewtwo oh there is an easey way to get out if you have a Pokemon that knows dig catch mewtwo and talk to someone
After you get the meteor go back to Fallarbor town and go into the house under the lady with the Azurill and give it back to prof. Cozmo and hell give you TM27 Return. A move that grows stronger the more the user likes you.
After you get the Blue orb, you will be able to go into the Cave of Origin in Sootopolis City. With the blue orb, you can catch Kyogre which is located deep in the cave. You might want to use a Masterball at your first shot, because this Pokemon appears only once! So if you try to lower it's HP but it faints, then that's bad luck. :P
^_^
Start finishing your pokedex, train every Pokemon to level 100, chat with friends in the union room, play Pokemon jump with friends, dodrio berry pick up with friends(all need a wireless adapter.).
Go to Island four, and talk to Lorelei, she'll go back to the elite four then.
now you can go back to the elite 4 or just train around the islands or try your team at the trainer tower on seven island or go catch unown.
after you get the sapphire go to celio he will give you the access to go t cerulean cave where you get mewtwo and other lv.50 to 55 Pokemon such as ditto kadabra golbat parasect etc.
Cerulean cave where you find Mewtwo
You cannot get the Red orb in Pokemon HeartGold. You can only obtain the blue orb. The red orb leads to Groudon and the blue to Kyogre. To get Groudon, you have to trade with someone to get it.
You need the Blue Orb.
Red Orb=GroudonBlue ORb=KyogreUnfortunatly, Groundon is exclusive to soulSilver, and Jygre is exclusive to HeartGold. So you will have to trade with someone.you can't you can only get the red orb and the jade orbif you want kyogre you will have to trade
After beating the game go to mt pyre and find the part where you got your orb Archie will be there and give you the orb now talk to the lady she will take them both from you.
The blue orb lets you get groudon in the first place mr Pokemon should give you the red orb that way you can catch kyogre.
You can climb to the top of Mt. Pyre and stop team mamga from taking the blue/red orb. Get the remainig orb, and actually in Pokemon ruby is the red orb and sapphire is blue because it said in my Pokemon sapphire/ ruby.
The blue orb is only in ruby and sapphire and emerald not firered.
There are only red and blue orbs.
Mt.pyre that's ware by:T.N.T :)
Return it to mt pyre.
The sapphire orb is in ruby and sapphire, not firered and leafgreen.
bring it to the top of mt.pier and you will see archie. he is retrning the red orb. go up to the lady and retrn the blue orb now. and......thats it.
Do you know the biggest cave? It's the north part of that
You can only get the Red Orb in in Pokémon Ruby; in Sapphire, you get the Blue Orb, while Archie, the leader of Team Aqua, takes the Red Orb.
on the inside of it
Archie will return the Red orb himself. As you are on the top of mt. Pyre, you should return the blue orb too.
If you have Pokemon Heart gold you get the blue orb from mr. pokemon.I'm not sure if you can get the blue orb in Pokemon Soul silver