Haze

• A ghost/dark type
• it's a shadow being with a constant faint purple glow. Its form is fluid and can change. Its eyes and inner mouth also always glow.

Haze is an aggressive and enraged spirit attacking others to chase them from the place that it used to live. While it does not attack the local pokemon who are native to the area- outsiders are subject to its wrath and it will lash out at them and chase them in the night until they leave the area that it deigns its "territory". 

It doesn't really listen to reason or want anything from anyone. It just wants to be left alone. Despite the fact that it doesn't listen, it does seem to actually be able to understand what people say to it, because if you have a legitimate reason to pass through its territory and tell it as such respectfully- it may leave you alone. 

Haze is the ghost of a Zorua who was corrupted after someone tried to improperly exorcise it as a normal Zorua when it was still alive. It was consumed by its desire for vengence and turned into the shadow-like being that it is now. It is a raging tempest of a spirit, wandering the lost woods of the sky islands and attacking anything and everything it comes across. 

Luckily, it's still just a Zorua, so it's not that inherently powerful (it can certainly hurt people- since its near impossible to fight against as an actually-deceased-spirit) but its attacks aren't very deadly and as long as you avoid its forest or only travel during the daytime, its easy to avoid.