Brock leads his friends to the Mountain Hut Maid Café, where waitresses Spring, Summer, and Autumn serve up fresh Miltank milk. Spring and Summer's Miltank are perfectly trained, but Autumn's new Miltank, Ilta, won't listen to anything Autumn says. Autumn is ready to give up on Ilta, but Brock wants to repair the relationship between Trainer and Pokémon.

With Brock's guidance, Autumn tries to earn Ilta's trust, only to lose her temper when Ilta still doesn't do what she expects. When Autumn tries to get Ilta to cross a bridge, Autumn nearly falls off and has to be rescued by Brock and Happiny. Frustrated by her own clumsiness, she's ready to give up until Brock gives her some words of encouragement.

After Autumn helps protect Ilta from a swarm of Beedrill, it looks like Trainer and Pokémon just might make it after all. In the meantime, Team Rocket tries to duplicate the success of the Mountain Hut Maid Café, but they've hit a snag: they have no Miltank milk! To remedy the problem, they catch Brock and Autumn by surprise and fly off with both the Trainers and the real target, Ilta! Brock's Happiny uses Secret Power to put Team Rocket to sleep, allowing Brock and Autumn to escape and defeat Team Rocket. With Autumn and Ilta finally a team, our own team of heroes gets back on the road toward Veilstone City!