They appear to be the youngest residents of Diglett Village. Ash and his friends met them when the group fell into a hole dug by Diglett. Rita explained that the holes were because of invaders coming to their village. Sue then asked them if they would help defend their village. In exchange, they would be provided free food and living conditions.
After eating, the two girls left, while the mayor of the Village and a town councilman explained that they needed help. Apparently, every year, a gang called the band of Diglett thieves visits the town to steal all of the Diglett. The kids promised to ward off the thieves.
That night, Ash and the others went to spy on the thieves. When they arrived, they were stunned to see Rita and Sue with the thieves. However, the kids soon learned that Rita and Sue were the grandchildren of the Diglett Village residents, and the band of Diglett thieves were their children. Every year, they "invaded" the village so they could check up on their family members. Now in on the plan, the kids went along with it, and everything went on as planned.
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