one more question

Yes. It is in the Team Aqua Cavern outside of Lilycove City. It is in the room where you are at like 5 rows of portals if you do the right combination of portals it will take you to a room where there are four pokeballs on the floor. It is one of them. Beware two of them are voltorbs.

Of course my friend!!! There's at least 1 Master Ball in each Pokemon game. The one I remember in this game is located at Team Aqua's secret base on a room with 4 pokeballs on the ground. 2 being electrodes, one a nugget and the other one the Master Ball.

It's in the Team Aqua Hideout near Lilycove City. After you walk through it a bit there's a room with warp pads in it, through one of them is a room with four items in it, and one of them is the Master Ball.

Its in the Team Aqua hideout in Lilycove. Keep searching the hideout by going through the portals and eventually you'll get to a room with 4 item balls, however two of them are Voltorbs. One is a master ball, and I think the other one is something like a Nugget.

Go to the team aqua hide out right side of lilycove.
Get inside and when you go to the area were there are 4 portals. Note:below these there are other portals in groups of three.
Try going to each of the portals try to explore the area until you go
To farthest area from the four portals I just talked about then you will apear in the right portal then skip the portal in the middle then go to the left portal.You will apear in a room with four pokeballs in the left side.(the two pokeballs at the left are electrodes)

There is a Masterball in the game, it is located in the Team Aqua Hideout which is near Lilycove City. You have to navigate through a series of portals to get to the room with the Masterball. In the room there are 4 balls 1 of which is the Masterball.