Rustbolt Landfill

Rustbolt Landfill is a trash-filled landfill north of Rustbolt City. It is where all the trash of Rustbolt City goes.

Geography
The Rustbolt Landfill is a disgusting place, full of trash bags and trash bins. There are a couple trainers willing to battle you.

At first, the Rustbolt Landfill will appear to have nothing to offer except a few trainer battles. However, upon arriving post-game, you will encounter Looker and Nora. They will tell you that there seems to be a Pokémon moving trash from the landfill back to Rustbolt City, and will ask you for help. If you agree, you will have to search Rustbolt City for eight trash bags.

Once obtaining all of the trash bags, upon returning and placing the trash bags in a circle, Pollusion will appear. Nora will mention she will leave temporarily to get help and Pollusion will battle you. However, you can't catch it yet, since it seems too aggravated to want to be caught. Therefore, you have to defeat it. However, afterwards, Nora and Looker return. A young girl will show up, too, saying Pollusion, who she calls Polly, is hers. She apologizes for any damage Pollusion has done and she thanks you, Nora and Looker for reuniting her and "Polly" together. The girl also tells a story of how the two of them got separated, and also mentions Healthia was with them, too. After all this, Pollusion lets the girl know that it wants to be caught by you, and you finally get the chance to do so. If you defeat it this time, you will be prompted to keep battling it again until you successfully catch it.

Trivia

 * Some of the trash bags in the landfill look similar to Trubbish, an official Pokemon that resembles a small trash bag.