Board Thread:General Discussion/@comment-24074103-20131204160455/@comment-679780-20140729013226

Myself 123 wrote: There's also Knuckles Heal, in which Knuckles heals himself with earth elementals. Everyone had a heal ability, some with half-baked Skill Informations behind them.
 * Sonic Heal
 * Tails Heal
 * Knuckles Heal
 * Amy Heal (She heals by thinking about Sonic)
 * Cream Heal
 * Rouge Heal
 * Chaos Heal
 * Heal Skill and Ult. Heal Skill
 * Recovery Mode

It's really an "excuse of gameplay" thing, just like how Sonic Wind is just an excuse for Sonic to have a cloned ability of Chaos Spear in Sonic Adventure 2.