Happiness

A Vulpin's Happiness levels indicate how well it will perform in battle. The unhappier a Vulpin is, the more poorly it will do, while the happier a Vulpin is the more damage they deal. A Vulpin's happiness level is depleted all the way when their Health Points reach zero and they are forced out of battle, but a Vulpin's happiness also slowly declines if they're forced to wander around their Home for a while with no interaction or adventure outside of the meadow.

The player can restore a Vulpin's happiness by using healing items (like Banapples and Starberries) on them, no matter if they actually need healing. They can also restore a Vulpin's happiness by petting them while the two are at Home.