It is not possible to do the masterball cheat without a Gameshark or Action Replay on Ruby although it is on Emerald.
just go to the rubursto poke mart
Throw the Poke Ball. If you mean Mew, than you can't.
With a Masterball
No sorry
Well some are invisible and some you find in a Poke Ball everywhere in the Game
A Pokemon can only hold a Master Ball if you give it to it as a Held Item. You get a Master Ball near the end of the game from Professor Birch.
It is in team Aqua's hideout, also if you win the lottery in Lillycove you have a very slim chance of winning one if every lottery number matches.
The only way you can get more than one masterball on Pokemon ruby/saphirre is you compeate in the Pokemon lottery corner. In Pokemon emerald you can have a Pokemon hold a masterball and then clone it.After you beat Team Rocket in the Silph Co. building, then the president at the top floor, after you beat Giovanni, will give the Masterball to you.
just evolve nincada and make sure you have a spare poke ball and an extra slot
Lilycove lottery
The MasterBall is located in Team Magma's base in Lilycove City.