>>44885811at this point if you don't know the myths or fairytales for Dedenne and Azumarill you shouldn't be here.
Dedenne is a fairytype because in France there is a version of the tooth fairy that takes the form as a mouse. The marill line is based on the moon rabbit in Japanese mythology.
For Snubull/Granbull they are literally labelled the fairy pokemon all the way back in GSC. There is some possible connection to Cu Sith as well.
Mr.Mime is able to basically make things physically manifest in the real world through it's mimery. It can create walls, chairs, cups, almost anything. It's also known to be a very good housekeeper and assistant. Lot's of fantasy creatures are known for being pranksters and helpers. So it walks the line between making sense as a psychic/fairy type.
I do agree with you that serebii and the lake trio should be reclassified as fairies for obvious reasons. Sorry for my autism.. I just really like fairy types.