Thats all you need to know there :x 5 Hearts which are parted in 5 sections each.5 Hearts = 25 sections too fill, or what is it you wanna knew exactly?
oooh okay I just need to grind then for full friendship XD Thanks
A tip, find out how often you can pat your digi (click on it), then do a fight, back to pat and so on, for me its the fastes way :x