Okay, I thought about it a little bit too hard, and I think that cyclizar and Heliolisk share a common ancestor.
They're both very fast, normal-dual-type, highly energetic lizards. They both have frills and neck sacks used as combination functional organs and display features, have a dark tail tip, and originate from wide open and sunny terrain.
My theory is that kiridon lostIts fighting type for normal over time, becoming less aggressive, and then split into two different pokemon, one gaining the electric type and sun-seeking behavior, the other retaining normal/dragon typing and its physical nature.
And then if you really want to go nuts with it, they had a successful hybridization where the normal types were recessive, and it became an electric dragon, eventually either becoming miridon, or the creature that miridon is based on
