>>28778926>>28781774>>28783906think about it
rock/electric raikou fossil, perhaps raikou came to alola a long time ago and propagated, or perhaps it originated in alola and one somehow managed to find its way to johto and became a legendary unique pokemon there. you find the fang fossil and it turns out to be the ancestor of raikou, a unique electric/rock typed fossil mon.
then, kabuto/ps can be rock/fighting or if you wanted to go there rock/ghos, and we can bring back one of the coolest pokemon designs. it could even have grown to a super huge size instead of being a 4'3" manlet mon.