I think I have like 12k certificates for phase 2, so a start. Medals, I wasn't hoarding. If its like phase 2 before summoning bosses will be less important because there may be plenty to kill without summoning your own. I did pull a lvl 90 phase 1 boss just before maintenance, I was happy that with just 1 RP I was able to have my good raid group kill it (2.3M), and only just starting on the third squad. So I should be able to take on any close to escaping phase 2 bosses.