In order to catch a shiny rayquaza in any game without cheating is to save right in front of any legendary and keep battleing it. I recommend using a masterball unless you are EXTREMMLY GOOD at catching Pokemon, It will take you about 14 hours to see one. Your chances of finding one are about 1 out of 8164. I migrated all of my good Pokemon in sapphire to platinum just to start a new game to catch a shiny kyoger, rayquaza, regice,regirock,registeel, and If you are BEOND lucky Latias(ITS YELLOW NOT RED!!!) Have good shiny legendary hunting:P!
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Also if your lucky you might get a shiny latos, it's green!
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How do you catch rayquaza in Pokemon black and white
You cannot catch Rayquaza in Pokemon Pearl. You will have to have caught it on Ruby/Sapphire/Emerald and migrated it to Pearl. Then you have to catch it at Pal Park.you cant catch rayquaza in pearl. you can only migrate from ruby,sapphire,or emerald or use cheat with action replay. you have to migrate it from ether Pokemon rudy/sapphire or emerald To get a Rayquaza in Pokemon Pearl you will need to trade with Pokemon HeartGold or SoulSilver. To access Rayquaza in Pokemon HeartGold or SoulSilver you need to show Professor Oak a Kyorge and Groudon. This will give the player a Jade Orb that can be used at the Embedded Tower to access Rayquaza in Pokemon HeartGold and SoulSilver. This Rayquaza can be captured and then traded to Pokemon Pearl.
Go to www.gamefaqs.net/Pokemon emerald gameshark codes.com
I thin the only way to get mewtwo in emerald is if you get action replay for GBA.
you can't normally, but you can with cheat codes for gameshark, ProActionReplay etc. (cheat devices0 you can compleat the pokedex then go to prof berc and git a one from difrint version but that's it without a game shark