It's here! Beware of spooky ghosts. Here are some of the rare mons that can spawn in this theme: Alolan Marowak, Alolan Rattata, Alolan Raticate, all Rotom formes, Luigi, Blacephalon, Hoopa, and Giratina. Also, Blacephalon has an improved spawnrate over regular UBs: it spawns as though it were 580 BST. Giratina spawns as though it were 630 BST. Also, Luigi is dead, he doesn't spawn anymore. Keep your eye out for pumpkins that hold candy bags. One more thing: There's some funky mechanics in this theme. Most Pokémon are disguised as Trick-or-treaters. And you can also use your first three Pokémon in your party freely.