From Bulbapedia, the community-driven Pokémon encyclopedia.
Mary (Japanese: ミユ Miyu) is a character of the day who appeared in Take the Lombre Home!.
Mary provided Ash and his friends with some water before she informed them that the villagers were in the midst of a crippling drought. A meteorite fell near the source of their water, and afterwards, a Solrock was seen in the forest at the same time the rains mysteriously stopped and their springs dried out. Mary explained that her grandmother and many of the villagers are convinced that the Solrock is responsible for the drought. When May's Skitty released itself from its Poké Ball and ran into a cave, Mary told May she knew the cave like the back of her hand, and went on to discover Team Rocket's pipe siphoning the village's spring water.
Mary was skeptical of the villagers' superstitions and sought a rational explanation for the drought. She watched in frustration as her grandmother and the other villagers performed a rain dance. Her village's water eventually returned after Brock's Pokémon used their Water Guns to put out an aflame Solrock, which led to a build-up of clouds and eventually a miraculous downpour of rain. Mary was relieved to have the spring water flowing again, but was then shocked when the village's guardian was changed to honor Solrock.