You are hiking in the mountains of the Sinnoh region, currently wandering around the lower portion of Mt. Coronet. As you round yet another bend on the rocky trail you're currently following, your gaze falls upon a hastily made wooden sign, installed to the side of the path, and reading "BEWARE! ULTRA BEAST SIGHTINGS REPORTED IN THIS AREA!".

You just shrug upon reading the sign – Ultra Beasts always seemed to be exclusively an Alola problem... surely they wouldn't appear as far as Sinnoh, right? Regardless, you keep moving on, passing a few more bends, before coming out to a small rocky ledge. Right below it, you see a large grove and lake, nestled away in a hidden little valley.

However, you also notice... an enormous Celesteela, seemingly resting on the ground, and mentally curse yourself for not trusting the sign. The giant alien Pokémon seems strangely anthropomorphic, with a well-endowed and somewhat chubby figure. As you get too caught up in staring at the Ultra Beast, you fail to notice the ledge shaking underneath you, until it is already crumbling and you are sent falling.

Instead of solid ground, you end up landing onto something very soft - a light-gray surface that easily cushions your fall, leaving you unharmed, and slightly wobbles under your weight. Looking up, you realise that you've fallen onto Celesteela's plump belly, her huge breasts looming over you like two large buildings, and above them, her small head. At first, Celesteela seems surprised, making an 'O' shape with her tiny mouth, but then smiles and blushes as she looks down and notices you.