Got Hatate up to 77/99, by clearing 1 from Suika, 1 from Orin, 2 from Utsuho, 1 from Satori, 2 from Byakuren and one of those was 12-5.
Wow, 12-5 is hard. I'm dreading 12-4 >.>
edit: now up to 83/99 by getting a couple from extra, as well as one of Suwako's and DNA's Flaw.