what are the halloween candies for?

where can i find the 3 spirits?

is rotom in one of those houses in the swamp?

thanks for answering bye

Literally if you play the event for 10 minutes you will find out all of those questions.

Yes he can but if you're going to reply the least you can do is actually answer the query.

 

Halloween candies are used to buy your way into serenia village and dread town, you need 5 for each and all can be found in murky town.

 

the locations for all the spirits can be found here.

 

I've not encountered a rotom in the houses and have not heard of anyone else doing so either.