Okay so...I was doing a lot of research on Harvest Moon DS Cute because I wanted to become a better player.
And since Skye is a wonderful thing to me, I researched him too.
I found that giving Skye something from the mines using your hoe like; Sunblock, Jewelry, ETC. gives him 300 AP.
Also, changing your clothes gives him 200 AP.
So this gives you 500 AP.
Talking to him raises it too (( I THINK...MBBY... ))
So his AP must be 10,000 to be Purple.
So I'm going to test it, because I calculated it.
I think that if I do this for 20 sunny days, I can get him to be a purple heart.
Hopefully!
Once I do it, I'll let you know!
I'm excited to see if it works.
:D

TIP: DON'T LITTER.