Sootopolis city, were Kyogre and Groudon are rampaging.
You go to Sootopolis City. There you will see Groudon and Kyogre fighting, and Rayquaza goes to stop them. Then he goes back to the Sky Pillar.
At the Sky Pillar.
sky pillar
Sky pillar.
You go to sky pillar and awaken rayquaza then rayquaza will fly out of sky pillar. Then go back to the place where groudon and kyogre is. IF YOU DONT KNOW WHERE SKY PILLAR IS I SUGGEST TO GO FIND HELP ON GOOGLE, YOUTUBE.
If Rayquaza flee'd from the Sky Pillar in Ruby/Sapphire there is no way to get another chance to fight him.
On top of Sky Pillar.
First find the sky pillar and get 2 the top and bring your Mach bike to get to the top. The sky pillar is after Pacifidlog town and before the enterance to Sootopolis city. When you get to the top of the sky pillar rayquaza will be at the top but it will fly away when you see it. But when the two legendary from ruby and sapphire stop fighting go back to the sky pillar and catch rayquaza.
You find it at the sky pillar after beating the Elite Four. The sky pillar is a short surf west from pacifladog town.
rayquaza
If you mean Rayquaza, then you can find it at Sky Pillar
"Where do you catch rayquaza in Pokemon emerald?"You catch rayquaza at Sky Pillar, which is on route 131, near Pacifidlog Town, in Pokemon emerald.In sky pillar in route 131. When you make the top of the sky pillar, you will see rayquaza sleeping. as soon you press A near rayquaza, it 'll wake up and battle you! i caught a rayquaza with a master ball!