When Sora wakes up, he discovers that Riku has kidnapped Pinocchio, who is unconscious. When Sora asks what Riku thinks he’s doing, Riku tells him that Pinocchio’s unusual existence – a puppet with a heart – might be able to help someone who’s lost their heart: Kairi.
Riku darts off before Sora can process this, and Geppetto takes out a chest for Sora containing the High Jump ability, a “Group Ability” that applies to everyone and costs no AP. Mobility abilities are fantastic in any game, so you’ll probably have it installed in your deck long before you process the idea of abstract concepts like skills being kept in boxes. Though if I can nitpick, I’d have rather the game turned the skill “on” the moment you receive it. I’ve seen that screw up a few young players.