Horde Location. I remember noticing at least one other evolved poke with bugged location in the dex, but i. Horde encounters are a new kind of wild encounter where a horde of pokémon appear and challenge you.
Always up to date with the latest patch (9.1.5). The horde can be found south of marion forks and east of the hot springs camp. These pokémon can be anything from a group of one species of pokémon, to a conglomeration of a couple that work togehter such as miltank & tauros, or who turn on eachother such as seviper & zangoose.