I use different methods for my particular games, depending on my mood.
Method #1: No Real Reason
Giant Horse - "Hunter" (because I use him mostly to run-down animals to get gourmet raw meat to sell
White Stalion - "Sprinter"
4/4/5 All-Black Horse w/ "Ancient" horse gear - "Shadow"
4/4/5...
Since I'm pretty much sure that Nintendo will NEVER make Amiibo data official DLC, and I'll never be able to get the ones I want (seriously, I dont want the figure just the data), I decided when I first played the game that I'd just do without Epona. Thankfully, I later found that, just like...
(If this has already be done, feel free to ignore this; if this hasn't been in the Daily Debate, feel free to take it.)
I was watching a few videos about morality factors in games and it made me wonder what if Nintendo made a game with such a mechanic, especially the Legend of Zelda series...