Actually if youre running PLD in fates, turn on tank stance and do everything to generate as much aggro as possible. That will normally net you silver (if not gold) fairly quickly. Use your oGCDs liberally as well. Dont save them. Depending on how long you been grinding every area for, you get a feel for what spawns where in fates. Stand in those areas and spam aoe during AoE fates. Boss fates you just need to aggro as much as possible.
For YoKai, you dont need gold for the medals, you just need silver.
Your only bane will be if you get to a map with BLUs spamming missile over and over and kill a boss in 3 hits. Thankfully this isnt to often on bosses but if you do run into them, there are atleast 2 other maps that the medals work on AND if things are that bad, swap to another minion and farm that for a bit.
