After the Nimbasa Gym match, Cilan convinces Ash & Iris to take part on the Subway Stamp Rally, which requires travelling across Nimbasa City, to collect stamps in order to battle Emmet & Ingo. However, while doing so, Ash & Iris encounter a lost Axew and decide to help it find its trainer. Will they be able to find the trainer and will Ash & Cilan be able to defeat the Subway Bosses?