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I doubt he gets into Ubers. I guess it depends on what this form has.
But his base stats seem to be around 100 hp/100 Atk/90 sp Atk
With prankster I was thinking choice Band pursuit/knock off/ trick/play rough/sucker punch/u turn
With an immunity to two types /prankster and a lot of resists with it's typing it can easily switch in on something and pursuit it or knock off a free item where z crystals and megas are gone.
It can trick with some walls too toxapex and and ferrathorn especially, and with prankster.
It can also eat a Prankste/dark type and play rough it with it's huge attack or get a free knock off.