>>31808533Pokemon wise I'd say either Alola or Hoenn, those tropical paradises are full of dangerous Pokemon, from the most common ones to the legendaries and mythical ones.
Hoenn also has some of the most intimidating and influencing gods that have catastrophic effects following their rampages, imagine primordial clashes like costant earthquakes, tsunamis, flooding and asteroids. Shit's scary. Groudon and Kyogre themselves are primordial and very instinctive.
At least in Sinnoh most would be unaware of what Arceus and its trio could come to.
Kalos is also a good candidate mostly because of how fucked up you must be to awake Yveltal.