Misdreavus isn't broken & can definitely appear in that raid! They start appearing at the 2* level, which is rarer than the 1* raids you typically see with one badge.
For context, Drowzee is the same odds in that den.
The Misdreavus @ dex # 1032 is the Possess type Misdreavus you encountered in the story.
I also encounter a script error twice.