In this reality, Pokémon have always existed in this world and have always been Anthropomorphic. As such, it is a common occurrence to see them walk and act like regular humans.

Now, back to our story.

You had just entered the mystical and occult place known as The Boneyard, where a skilled necromancer was said to have made its abode.

...Except that this "mystical" place looked more like a junkyard for skeletons, with masses of bones of different shapes and sizes piled into gargantuan hills. The eerie aura wasn't really present either. What a disappointment.

Anyways, inside a large beast's skeletal remains, there was a campfire with a peculiar creature seated next to it. It must be the famous necromancer that you've heard about.