Badly describe your favourite Pokemon

It's mostly black, and is probably very difficult to see in the dark, but the end of its tail looks like a shooting star when it moves quickly at night. Obviously, during the day you can spot it more easily. Will probably hunt you when it sees you, and it can always see where you hide.

Its ability is busted in competitive battles, but unfortunately its stats are.... mediocre at best, and there is another Pokemon with the same ability, which outshines it in every way.