>>46208707Further behind the town, away from all the others, there would be one final house, if the player collect at least one candy from each region (except 1 and 8, since they don't have one), when knocking on the door, it would simply open, inside, lots of Ghost Pokémon messing with furniture and such, and some notes here and there talking about a strange kid always talking with/about Ghost Type Pokémon and acting as if it was Halloween all year long.
After exploring, upon approaching the door to leave the house, this time, the player would hear the knocks, opening the door, there's a kid doing(?) "Trick-or-Treat", then, the player would be given a choice of mimic the other trainers and challenge the kid for a battle, or just give out a candy of the player choosing, if given the candy the kid wants, they would just skip the battle and receive the badge, otherwise, the kid would just thank them and close the door, after that, leaving the house would teleport the player to the Pokémon Center again. Choosing to battle, and winning, the player gets the badge and keeps all the candy.
After receiving the Halloween Badge, upon leaving the house, the player would find the town to be completely deserted (even the Pokémon Center), truly a ghost town, and now would be able to enter the other houses, get some random items inside each and read some diaries telling a little bit about the town's former inhabitants (and maybe realize that all the diaries have a Halloween day as the last entry).
After this first visit, were the player to decide to go back there, they would find the deserted town during the day, where everyday some random item would appear in one of the houses, and a cheerful Halloween town during the night, with NPCs not only inside but also outside the houses.
Again, sorry for the [Wall of Text].