you go to the p2 lab
The Dubious Disc evolves Porgon2 into Porygon-Z
The games description says that it is a disk overflowing with data.
Go to P2 labrotory (you need Genesect event) an go inside the lab and a man will give you it
go into the right entrance of mt. mortar on route 42. when you get in, on your right there will be a wall to use rock climb( hm get off prof oak. heres a link:...