At the risk of getting called out on ridiculing Mary Sues when I have this, I'm just gonna say it...
A while back, I had the thought "What if pokemon actually could push beyond their species' limitations?" So, I've been toying with the idea of psuedo-evolutions and how they would work. I decided to label it as 'ascention', but most people would recognize is as 'SOOPER SAIYAN POKEMANZ HAX'. That is because it CAN be a sort of temporary super form, but it can ALSO be a permanent change. The only way an ascention can really be attained is by proper and/or severe training. The closest I could think of for a 'canon' example of ascention in pokemon is.... Is.... *grumble grumble* Ash's pikachu...
ANYWAY, any pokemon can achieve ascention, but it would be more common among fully-evolved pokemon or pokemon with specific evolution conditions (such as trading, holding a specific item, or stones).
And now, I await the "LOL U IZ STOOPID" comments and the sarcastic "This is a really good idea, NOT" comments.
-w-