yes you do get a master ball
after getting the 8th and final badge in jhoto, prof.elm will call you saying hes got a gift
go to his lab and talk to him, and he'll give it to you
you can also get master balls by winning forst prize in the id no. contest in goldenrod, but chances of that are low...
Join this site...http://s14.invisionfree.com/ChaoticRoleplayRealm/index.php?
and this one...http://gameknot.com/?rfr=diezombie...when you sign up the second one, where it says referals by, type in diezombie