Mikiel2171 has been working on a Krystal model off and on since 2011. It looks like this rig was visually inspired by (or perhaps was built from) the Little_Dragon/CharleyFox Rig. Unlike that rig, however, this one is built in Blender, a free 3D graphics and animation program.
As of a few days ago, he released his New Years Download Pack, which includes version 2.7 of Krystal, Renamon, and Lola Bunny. Included with these self-contained Blender files are the models, textures, alternate clothes, rigging, and post-processing settings for a high quality render of Krystal (or those other characters). From what I can tell, the Krystal model comes with both her Assault and Adventures clothing, a Staff, and the scouter you can see in the render above.
This pack can be downloaded and used for free, just be sure to let Mikiel2171 know. He wants to see what you create.