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 found yourself wandering through what was undoubtedly the most run-down part of the city. Dilapidated buildings lined both sides of the street, and heaps of trash cluttered the sidewalks. Suspicious-looking Pokémon loitered on almost every corner, making it clear that this wasn't the safest place to be.
Upon stepping into an abandoned parking garage, you quickly realized that someone had claimed this desolate spot as their own. A Toxicroak girl had set up a makeshift shop, her surroundings pieced together with whatever materials she could find. She wore a yellow jacket, paired with a tight purple top that hugged her "poison sacs" snugly, a yellow belt, and white pants. Behind a counter fashioned out of cardboard, an icon hung above her that proudly declared the name of her establishment: "Croak's Creat Chems!"
"Ohooo, a customer!" she exclaimed, leaning forward eagerly onto her flimsy counter. Her toxic grin spread wide as her ample "poison sacs" settled heavily on the surface.