You can find these in the most right and up corner. There is a mountain over there and royal griffin spawns there (be careful about gigas).if they do not respect you you cant tame them. For their respect you should have 1 of them:
-You should have a gold crown its 150 amber in the market i think.
-You should be 85 to 95 to get one. (85 for the lowest, 95 you can pretty much tame every griffin.
-Or your name needs to end up with these letters
-gast,-den,-ssa if your name ends up with one of these after level 40 you could tame the same suffix as your name for example:
Lets say my name is thell my name end up with -ell so i can tame a loyal griffin after level 40 with my Suffix