My HW and I (HP) just got the quest for pet evolution to "kill an MVP". We found the Evil Snake Lord and they got the winning kill on the MVP, but only their quest was marked as complete. We were in the same party, I was alive, and I was on the screen of both my party member and the evil snake lord as it died. I wasn't sure whether this was a suggestion or bug fix request, but this quest should definitely be party based if possible, so that just being in the party/screen of the MVP kill will clear the quest. I don't think it was user error, but we've only tried this MVP so far. Will report back if more MVPs fail/succeed. Thanks!