this idea when I (used to) talk with someone about a Buizel and a Lucario fusion. Will not say the name of the user but this idea has been on my mind lately and now it out XD.

I'm sure all (or some) you remember of the slime chamber that was abandon years ago that somehow had side effects. Fusion and expanding any creature to enter in it. Two were already been in through it and seem she living a happy life now ^^, now we have two poke gals wondering around in that abandon facility. Seem they were curious about the rumors about it.

The story to how it happen is, the Buizel was jealous of the female lucario size, she heard the rumor about the facility. There were multiple rumors, like two hot chick were fuse together or something happen in there. So she asked the lucario to come on to this facility. So to make it short, they found the facility, Lucario wonders around amazed at the sight, Buizel founds from documents and how the process works and what it "actual" purpose was, Buizel sees lucario looking down where the pit was, Buizel pushes Lucario along with herself as both fall and dive into the green goop.

Then that how that happens right above, Buizel please but the lucario is piss off at her.