Ep. 12: Ash y N chocan por sus ideales en las Ruinas Blancas mientras N roba la Piedra Luz de Cedric Juniper.

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At the ruins dedicated to the Pokémon Reshiram, N steals the Light Stone from Cedric Juniper, and Ash's attempt to stop him ends with them separated from the others. Team Plasma move to attack the White Ruins while Team Rocket watch on in anticipation, and Iris, Cilan and Looker attempt to fight off the enemy forces. (Source: Wikipedia)