I
finally bred my 6IV, shiny Ditto! Took
- forever - to figure out what parents to use.
You'll need the following from Pokemon X:
1) A male, level 69 Rattata named Sloof. Ensure that your Rattata is in the top-percentage of all Rattata and has a Jolly nature.
2) Let Sloof hold Miracle Seed.
You'll need the following from Pokemon Y:
1) A female, level 100 Zubat named April. April - must - have a Relaxed nature, and can only have gained levels via Rare Candy.
2) Let April hold Kangaskhanite (you won't miss it, since it's banned in OU anyways).
Trade either Sloof or April to the other game, while holding the 3DS initiating the trade upside-down (this is an exploit of the method to evolve Inkay into Malamar).
Put Sloof and April in the Day Care. When the Old Man is facing away from the fence, talk to him. When he tells you that he doesn't know how it got there, but your Pokemon had an egg, question his qualifications for running a Day Care and call Pokemon Protection Services immediately.
Don't bother collecting more than one egg, unless you are greedy, as the resulting baby is guaranteed to be a 6IV, shiny Ditto!
You're welcome :)