Best way to get Advance Capsule Ds???

Need some guidance team...

If you are in an Alliance, and have been for at least 7 days, your Alliance Leader or Officers can purchase Advance Capsules for everyone in the Alliance at 50 Alliance Points a piece (assuming they have unlocked the Alliance Shop). Other than that, your other option is to collect as many A capsules as possible and turn those into D capsules.

run mission's that take F and you will earn D capsules