Ash's Krookodile is a ground/dark-typePokémon owned by Ash. It is the ninth Pokémon he caught in Unova. It first appeared as a recurring Pokémon until it was captured. Krookodile is one of Ash's strongest Pokémon in Unova.
Krookodile first appeared as a Sandile, known as Sunglasses Sandile because of the sunglasses it wore, until it evolved into Krokorok while battling Ash's Pikachu. It blasted off after getting defeated in later episodes, sparking a rivalry with Pikachu.
Krookodile reappeared as a Krokorok and was captured by Ash, officially making him part of the team and the ninth Pokémon Ash caught in Unova.
Krookodile battled against Skyla and her Swoobat and was defeated with Air Cutter. He and Ash did some training with Brycen and his Beartic. It was used in the Icirrus City Gym where he was used against Brycen's Vanillish but was quickly recalled. He was later used against Brycen's Beartic where he won, winning Ash the Freeze Badge. Since it fully evolved it became a real powerhouse in his team defeated Iris' Dragonite with its new power and its speed has increased.
When I was a Krokodile, along with Jigglypuff and Snubbull are the three pokemon who were following Ash and his friends during his adventures. Interestingly, all three have three objects: Jiglypuff had a microphone / marker Snubbull had few bows and Krokorok his sunglasses.