Honestly atm there's not many moves off the top of my head I think'll become Fairy like Bite became Dark, and the odds are sorta on the low side/it'll only really be really old moves that are likely to be retconned.
Most attacks I'd say from Gen 2/3 onwards were made with the types a lot more in mind and with a lot more knowledge and security in the franchise
Compared to back in Gen 1 where Pokemon was still a big gamble and a buggy mess with tons of removed features from when they were planning it.
'Success rates are but scientific theory. A brave heart will defy any odds!' 'Don't beg for things, do it yourself or else you won't get anything.'