1. Give him either 3 eggs, flour boxes, big fish, or summer crops while ur pinapples grow. (or 1 of each) (b sure to plant A LOT of pinapples!!)then give him 3 pineapples a day.
2. every now and then wrap his presents, especially on his birthday, Summer 22alt 17
3. talk to him as much as possible. it may not raise a heart, but it will eventually help. dont talk too much, though!
4. do the heart events (also listed on fogu) as soon as his heart changes.
5. NEVER GIVE UP!!!

~NintendoGirl97, the guide to Kai101

P.S. sorry guys there are a lot more tips but my fingers are tired from typing