From Bulbapedia, the community-driven Pokémon encyclopedia.
The mayor of Diglett Village (Japanese: 村長 Village Headman) is a minor character who appeared in Plant It Now... Diglett Later.
The mayor tried to stop the Diglett thieves from taking the Diglett. Ash and his friends helped the mayor prepare to defend against the thieves, but after discovering that the real reason thieves steal the Diglett every year, they agree on helping the thieves. It turns out that they want to check on their parents and make sure they stay fit.
After all the thieves were driven away or captured, the mayor gives Ash and his friends a Silver Wing Badge for their efforts in driving the thieves away. They were happy to get the badge and wondered if it was related to the silver Pokémon they saw earlier.
| It is possible that the Mayor of Diglett Village has some of the Diglett because the Diglett Thieves were coming to steal them and most of the residents have some as well.
|| Plant Them Now… Diglett Later