>>28301586That was plain cloning, what were looking at here in S/M is genetic merging, trying to push incompatible genes together and whatnot.
Lets look at the broad picture since this game occurs after all the other games, ask yourself what happened to the remaining scientist in the Pokemon mansion on Cinnabar after it erupted.
Or if we go further, how long have Aether been around, could they have flown agents to the sites of the important events of each region to see if the could collect any "material" for use.
Then again when have GF ever referenced more than the previous region they made and some samples of whats to come.