Somewhere in the aqua hideout (you have to be in lilycove city)
You get the master ball in the aqua Hideout
In the Aqua Hideout.
Team Aqua's hideout
No only in aqua's hideout.
You get it from the team Aqua hideout.
Beat Archie
In the team magma/aqua hideout. The other way is to win it in the lottery.
You can find master ball in Team Aqua's hideout, or you can get it from the Lilycove Lottery draw. But the best way is to get it from the hideout.
In the office of team Aqua's hideout.
you find it in the team aqua hideout
it is in the team aqua hideout by the electrodes