Well there are some things to keep in mind here guys:
1. This is a fan made trailer, so of course it's not going to be amazing quality.
2. This was a spur of the moment idea the two had of creating a dark twist on something. In response to your comment Iris, you are absolutely right. This isn't anything like the Pokemon we are used to. It's an interesting new twist on a much darker themed Pokemon. Also, I assume this is taking place in a future time setting, as now battles are underground and run by Team Rocket, and like Brock said that everything they worked for was gone.
However, I can see why this trailer would turn people off, and at first I was very reluctant to accept it, but I watched it a few times and I liked it even more with every view.