That's fine, whatever works. Though optional, you could have the same Pokemon UT and another same Pokemon EV trained for both Skorupi and Larvitar. For Larvitar, you really have no choice but to make it level 55, because there are no level 50 Tyranitars around. =\
If you gave me a Jolly Drapion and Quiet Larvitar as a whole, that's fine, too.
(oh, and speaking of cloning, sadly I don't own an AR...R4 cloning is possible, but time consuming, but whatever...)