While being let out to play by their trainers, Pikachu and Piplup wind up separated from their Pok&eacute;mon friends and wind up travelling with a Skitty into a strange dimension, unknowingly followed by Croagunk, Team Rocket's Pok&eacute;mon and a Marill that's desperate to have someone hear her sing... <br><br>
(Source: Bulbapedia)

After defeating Brandon and declining the offer to be a Frontier Brain, Ash sets off to travel through the far away land of Sinnoh. Once he gets there, he meets up with Hikari, a local trainer from the region, and they decide to travel together.

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