no where, thats the only one in the game if you dont trade over game.
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the master ball is in team aquas hideout. When u find the room with 4 pokeballs the one on the top left (I think) is the master ball.
The room with a bunch of poke balls beware of Electrode though catch one he will be usefull because hes ultra fast.
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You get it in The Team Aqua Hideout by Lilycove City.
There is a master ball in the Team Magma's hideout in Pokémon Ruby Sapphire, and Emerald. Look in the Hoenn region for the Team Magma's base of operations.