At "No Way Out", have Batista lose to Edge during Rey Mysterio/Batista's Road to WrestleMania XXIV. This will unlock a Move-set for CAS mode. Repeat the same thing for Rey Mysterio to unlock another Move-set for CAS Mode.
Restart your career mode with the same superstar or diva. You will lose all gained abilities. This will take longer to gain Resiliency if your attributes are higher, and if you are above 80 overall you will not be able to get Durability. Always create doubles of a CAW or CAS immediately after making them. By doing this you can start over with the unused copy and gain those Resiliency and Durability in a quicker amount of time if you end up gaining unwanted abilities.
During Rey Mysterio/Batista's Road to WrestleMania XXIV, have Batista win the Royal Rumble, Rey Mysterio lose to Edge at No Way Out. Then, have Batista lose the World Tag Team Championship against John Morrison and The Miz to unlock a Create-A-Superstar Pre-Moveset. Repeat this for Rey Mysterio, except for the match with Edge at No Way Out in which you will have to use Batista.