Board Thread:Questions and Answers/@comment-11239531-20150519172824/@comment-11239531-20150520112003

They are supperior versions of other cards/Type, you need a main monster name + monster of certain level to send to Grave in order to get the Special Summoning of an evolute monster.

After special summoning it, they gain "stage= equal to the total levels used to special summon that monster.

Evolute monsters have E counters, which they use for their effects, and gain more field advantages.

http://vignette4.wikia.nocookie.net/ygocc/images/d/d5/Stage7.png/revision/latest?cb=20140803133226

also, BatMed agreed, he said as long you give him credit