Infinite you can win them from the lottery in lilycove city.
yes
cheat codes or gameshark
well you can make a Pokemon hold a master ball and clone Pokemon
sorry, but that is not an actual game, ruby is a game, but i have no idea what ruby destiny is.
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Just one
By a glitch at the battle tower in the frontier after you beat the Pokemon league
you can search in your bed there will be some i am sure of it
Win the lottery at the lilycove dept store.
there is a game shark cheat THAT WORKS for Pokemon ruby there is no codes. it's for having all the poke balls,so then you will have 99 master balls and then give one to a Pokemon and trade it. once you have traded it, take the master ball from it and repeat this process.
weaken it, make it sleep and use many ultra balls it will work eventually.
well i don't have ruby i have sapphire and i know it sucks but there is only one master ball in the whole game and that's in team aquas hide out