This works with EXP candies but doesn't seem to affect wild encounters.
Edit: The multiplication happens in trainer battles, but the number doesn't stick. E.g. Skwovet goes up from 13 to 24, but at the end of the battle it's only gone up 1 level.
Likewise the Pokemon size cheat doesn't seem to...
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.