Why isn’t Overqwil used more?

It’s really fast and strong especially in rain, which swift swim is its most common ability. It has access to haze. It one shots common threats like whim and A Ninetales. With a Tera dark crunch, it can one shot a low bulk gholdengo. I think this Pokémon is seriously underrated. I think it could be a hidden threat that could rank high in a regional. I am pretty new to playing, so I could just be yapping, but I feel like this Pokémon has the tools to be good