It's not "Pink Vynn"

I take it not all medals are like this from what you state and the obvious given (ie, Pink Been Slayer, Horntail Slayer, Level 200).

One question though, does the Mu Lung Gym Conqueror, is that a monthly medal as you state with the bossing and donors.

Actually, Pink Been and Horntail Slayer medals are only ONE per server as well. The person with the highest number of kills gets it. The level 200, I'm not quite sure about, since I haven't even seen that one yet and there are a ton of level 200s around, but I guess it's whoever gets it first?

The Mu Lung PQ medal, I would guess, is for the person who beats it completely through the most in the server. For ALL one-of-a-kind medals, they get reset the first of EVERY month.