From Bulbapedia, the community-driven Pokémon encyclopedia.
Wilma or Grandma Wilma (Japanese: タツばあさん Grandma Tatsu) is a Move Tutor in Diamond, Pearl, Platinum, HeartGold, and SoulSilver. She lives on the northern, foggy stretch of Route 210 in the first three games while she lives in Blackthorn City in the latter two.
Previously, she lived in a famous city of Dragon Tamers until she moved to Sinnoh, and due to this, she is able to teach the move Draco Meteor to the player's Dragon-type Pokémon if its friendship is maxed out.
In the anime
Her only appearance was in A Meteoric Rise to Excellence!. Ash and his friends met up with her on witnessing her teach an Altaria the attack Draco Meteor. She explained that Trainers leave their Pokémon with her so that she can teach them Draco Meteor, and Altaria is one of the Pokémon she is training.
Later, a wild Gible that Wilma knew showed up and she explained that it shows up frequently. Ash and his friends helped her rescue Altaria from Team Rocket and she later showed them the way to Daybreak Town.
||タツばあさん Grandma Tatsu
||From 竜 tatsu, dragon.
||From abuela, grandma.
||진할머니 Grandma Jin
||진 (辰) is derived from an alternate reading of tatsu. 辰 is an earthly branch that is associated with the dragon.
||龍婆婆 Grandma Lóng
||龍 means "dragon"