Ep. 91: The Spectral Express!

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While heading to Lateral Town via train, Satoshi accidentally bumps into Onion, who loses his train ticket. Satoshi and Go try to return Onion's ticket, but the latter flees and enters the ghost train. Satoshi and Go also enter the ghost train, but Satoshi becomes possessed by a spirit after he touches a Mikaruge stone. The spirit is eventually returned to the Mikaruge stone, and the two boys arrive at their destination. However, Onion and the ghost train disappear right after it had arrived in Lateral Town. (Source: Wikipedia)