It's the 8th year of having Gens and Mimi (with Grevy) going out for Halloween.
While Gens is keeping it simple with a witch hat. Mimi is now dressed like a Pachirisu, while Grevy is looking like a Houndoom.

Notes:
I know I mentioned that I was going to post about someone having a chance of joining them, but I ended up doing other things.
There was going to be more with this, but not wanting to take too long, it ended up being this. (Maybe later the original idea will be shown off)