A Pokemon can only hold a Master Ball if you give it to it as a Held Item. You get a Master Ball near the end of the game from Professor Birch.
With a Masterball
No sorry
Lilycove lottery
The MasterBall is located in Team Magma's base in Lilycove City.
Team Magma Hideout
use gamesharkDCEEEC34AFEADC26 masterball is pc
In team magma's base near lilycove city
after you beat the seventh gym, if you follow the gameplay, you'll get it
You get it from a guy at the top of a big building in the first town you get to
Assuming you already know where to get the masterball from the Lilycove Team Aqua (magma in ruby i think) Base, the only other place where you can get a masterball is by winning the grandprize in the lottery run by the Lilycove depatment store. Though I wouldn't hold my breath if I were you... its not likely you'll win the masterball :P
No, EX Pokmon do not count as basic Pokmon in the Pokmon Trading Card Game.
inside team aqua's base near lilycove city