Wiglett was recently added to Pokémon Go as part of the new biomes update and could only be found on beaches.
For those not near a coastline or ocean, this is horrendous news on the hunt to catch ’em all, as it might mean traveling for several hours just for a small glimmer of hope of finding the new Galar Pokémon. Even then, we need to catch several more to get the candy needed to evolve it into Wugtrio.