Board Thread:Tips, Tricks, and Questions/@comment-85.29.78.114-20131105120845/@comment-6459948-20131107030925

it appears that you no longer need specials to evolve rare monsters, however super rare monsters, ultra & epics still require them.

They probably changed this as no1 I know had ever evolved a rare monster (atleast that I had seen)

But its good news, there are a few interesting rare monsters out there that I wouldnt mind seeing evolved forms :)