Board Thread:Questions and Answers/@comment-64.233.173.223-20150328005721/@comment-27164679-20150328010940

I'm not sure what to do for the treasure collecting thing. Normally I throw away all treasures I won't need (like the C~A ranks and some crappy S ranks) but if you really can't stand throwing them away I guess you'll just have to expand your treasure cabinet.

If you evolve a treasure and it changes its grade, the upgrade price and success rate also changes to that of the new grade so you should just upgrade it before evolving.