In a way, its kinda not too hard to figure out.

 

Start with Deino...An innocent little, playful little thing that tends to 'play fight' with everyone or everything. But cannot see outside its own head (world) yet (picture; destiny islands).

 

Level 50, it evolves into Zwealous....Which has two heads. Who struggle and fight each other. This could indicate a struggle between best friends (Sora and Riku), and the 'blindness' shows Riku is unable to see past it....yet. But theres also Ansem. A 3rd force, causing the two not to get along and a 'struggle' with riku's 'inner darkness'. And inability to see past it...hense the blindness.

 

Then we go to Hydreigon.

 

EYES OPEN, IN TOTAL CONTROL. Suddenly, 'ansem' isn't much of a problum anymore, pokemon doesn't struggle with itself as much....uses darkness like its b***h and has 3 heads resembling best friends riku sora and kairi?

 

I dunno if it fits 100%. But its just something interesting I came across.

 

Thoughts on this?

 

And, yay, a riku related thread under pokemon! *SHOT*

It does make quite a bit of sense actually. Riku is a character whose story line is about how he has grown over time more that anything else and Pokemon evolution in general, not just Deino Zweilous and Hydreigon, is about growing up and learning new things two. However this line and Riku, now that you mention it, do have a fair bit in common.