Dark Evolution

Dark Evolution (暗黒進化 Ankoku Shinka, ダーク進化 Dku Shinka) is a corrupted, forbidden, and dangerous form of normal evolution. =Appearances=

Digimon Adventure
When Taichi calls Greymon to try to super evolve in "Dark Evolution! Skull Greymon" with disregard to Agumon and the others' feelings Greymon evolved into Skull Greymon. In this form Greymon lost all sense of himself and attacked anything and anyone nearby.

Digimon Adventure 02
In "The Evil Ring's Magic Runs Wild" the Digimon Kaiser seizes control of Agumon with an Evil Ring and attempts to forcefully evolve him into Metal Greymon. Instead, Agumon evolves into Skull Greymon and runs wild.

In "The Enemy is Metal Greymon" the Digimon Kaiser develops the Evil Spiral and uses it to seize control of Agumon again. This time the Dark Evolution is successful in evolving Agumon into a virus Metal Greymon which the Digimon Kaiser is able to command.

Digimon Tamers
In "The Kindhearted Hero, Leomon Dies!", Takato, jealous by the death of Leomon at the hands of Beelzebumon, he calls Megalo Growlmon to accidentally dark evolve and become Megidramon, whose uncontrollable form almost destroyed the entire Digital World, from the power unleashed by the Digital Hazard symbol on its chest, concurrently having an effect on the Real World.

Digimon Savers
In "The Day of Parting - The Strongest Enemy: Thoma!", jealous by Thoma's apparent betrayal caused a dark aura to emit from Masaru's body, accidentally dark evolve to Shine Greymon into Shine Greymon Ruin Mode.