you have spot on this map ?Plat and truth is gonna be the hard ones to get you basically have to farm r4 and maybe even some parts of r3 to get those since they killed all the map farming spots. I think the mobs in ezker map (the ones you need to kill during r5 quest) also drop plat.
Keep in mind that all of those are not max pdef you can only get max pdef from the chest