How do you get a shadow chao in sa2b

You can get a Shadow Chao by raising it to a Neutral/Run/Run, and this makes a Shadow Chao!

You do this by first making your Chao's Running its main stat. Give it Green Chaos Drives, or animals that raise its Running like a bunny rabbit. Be sure to keep it Dark.

Once it evolves, it should be a basic Shadow Chao (Neutral/Run). This would be its FIRST evolution.

Now keep continuing to raise its Running. When it gets older, it will gradually change into a Shadow Chao (Neutral/Run/Run).

Hope this helps! :]