How do i get a dark chao? and how do i get to the dark chao garden? (this is on sonic adventure battle 2)
Raise a chao with a Dark character (Shadow, Eggman, Rouge), and if you like, feed it dark fruit. Keep petting it and give it lots of attention with those characters until its colour changes to black, and when it evolves, it will be a Dark chao. Evolving a Dark chao also opens the Dark Chao Garden.

~ Crazy C Lea