Solrock and Hasubrero! Legend of the Forest! : Season 7 Episode 23

Low on water, our heroes stop by a small village hoping to refill their canteens at a world-famous spring. On arrival, however, they learn that the spring has recently run dry, an event the locals blame on the Solrock that mysteriously showed up in the area only days before. Ash and friends refuse to believe that this Solrock, which had help them out in a time of need, could be responsible for the drought. Teaming up with a local researcher, who is likewise searching for a more scientific explanation, these young Pokémon trainers set out to clear Solrock's name.