If you are good at catching legendaries, then you would need at least 10 but 15 would be safe. If you are not good at catching legendaries, then I would get 25 ultra balls.
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Buy ultra balls in Fuchsia city or Indigo Plateau.
well what you have to do is beat the elite four get mewtwo and buy ten pokeballs at whatever store and then talk to prof. oak and go to a poke mart and buy this time a ultra ball and then check your menu and poof there it is and im not lying this cheat is for Pokemon fire red and leaf green
ANSWER 1:Mewtwo appears only in Fire Red and Leaf Green. You can catch him in either of those games and then trade him to Pokemon Ruby.sorry mate its impossible only way is to trade like this guy said (: (: (: (: (: (: (:ANSWER 2:I regret to tell you that you cannot catch Mewtwo in Ruby. You can only catch Mewtwo in FireRed or LeafGreen. (You can use cheats to get it but it wouldn't be as fun).Mewtwo is at Level 70 in LeafGreen and FireRed so use an Ultra Ball/Timer Ball/Master Ball.If you need/want a Mewtwo you can trade Mewtwo into your Ruby/Sapphire/Emerald Game.
This is a NO-TRADE party... 1. Charizard (fire/flying) 2. Dragonite (dragon/flying) 3. Aerodactyl (rock/flying) 4. Mewtwo (phycic) 5. Suicune (water) or lapras (water/ice) 6. Raichu (electric) The best way to catch Mewtwo is to freeze him and get him into the yellow/orange health and throw an ultra ball at him. ( I caught him on the first ultra ball doing just that.)
well the olny way to catch chansey in a heat beat is with a master ball. if you want it just have a Pokemon that can use any sleep attack on it and lower its health and then a ultra ball and you should catch it U idiot u cant even use master or ultra balls. u only can find chansey in the safari zone. And u cant use master or ultra balls in the safari zone. just throw a rock or 2. that's how i cought mine