no u cant buy masterballs in any of the Pokemon games except with cheats may b
you should use it on ever rayquaza or deoxsys
a master ball!!!
you have to cheat for it and use a master ball !
you have to put him to sleep then use a ultra ball or master ball
you can use master ball in caught the groudon
you don't get the master ball from may in emerald, you get it in the team aqua/magma hideout in lilycove. that is the only way to get a master ball , unless you win the loto ticket drawing or use an actionreplay or gameshark.
just weaken it and use a master ball.
You can't (unless you use cheats).
You Can Use A Cheat That Lets You Walk Through walls and you can walk over to the master ball
You can't get another master ball in emerald because there's no one will give you the master ball just the general will give you that.
to catch raquaza easily on emerald, use the master ball at the start of the battle... and you're done!
birth island you meet deoxys on level 30 use master ball or a ultra ball
master ball