It’s not just that he’s far from home, it’s that we’re in a totally different biome. Biomes are areas of the planet with a similar climate and landscape, where similar animals and plants live.
The biome concept organizes large-scale ecological variation. Terrestrial biomes are distinguished primarily by their predominant vegetation, and are mainly determined by temperature and rainfall.
Pokémon Go has added a biome system to the game, making it so some Pokémon, like Wiglett, only spawn in certain areas. Those hunting for specific Pokémon will want to head over to these biomes ...