Monster Palettes

To my knowledge each monster and esper have their own palette, except maybe Crusader that has 2 or 3 assigned to its sprites. Having monsters sharing a palette would be an exception and I never heard someone reporting this, there are 384 sixteen colors palettes and 416 monsters, it was designed for each monster to have a dedicated palette not shared with other GFX, the reason you have 100 eight colors palettes free is because some monsters are blank, some use the guard palette for special purposes, some use only 8 colors, etc.