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Krokorok made its first appearance in A Sandile Gusher of Change! as a Sandile, where it was revealed to be the leader of a group of Sandile who lived near a local spa resort. It and the group caused trouble at the spa resort on Route 1 so that they could get the attention of the owners. It was actually trying to save the other Pokémon in the area because it knew that a geyser would soon erupt. With the help of Ash, Iris, and the son of the spa resort owner, Dan, Sandile was able to save the Pokémon. In the end, Sandile was shown to have gained respect for Ash, and as such, began to follow him.
Sandile reappeared in Dancing With the Ducklett Trio!, separating Ash from the group in order to battle Pikachu again. However, a wild Ducklett stole its sunglasses and stopped the battle. Sandile was deeply saddened without its sunglasses, losing its usual confidence and becoming quite cowardly. With Ash and Pikachu's help, it defeated the Ducklett and claimed its sunglasses back. Later, after being healed at the Pokémon Center, Sandile finally got the battle it wanted with Pikachu. Sandile dominated the battle to start with and eventually evolved into Krokorok. Pikachu soon gained the upper hand however, and sent Krokorok blasting off when his Electro Ball attack collided with Krokorok's Stone Edge attack, causing the stones to hit Krokorok and send it flying.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
Trivia
Similar to the recurring Jigglypuff's microphone and Snubbull's ribbons, Krokorok has a distinctive item of its own that it carries around constantly: its sunglasses.
Krokorok's evolution is also the first live evolution in the Best Wishes series. It featured a new evolution effect, replacing the one that had been used since the original series.
Related articles
For more information on this Pokémon's species, see Sandile and Krokorok.