What are 2 rhetorical devices used in "Frankenstein"?
There are many in that interesting and provocative work!
Diatyposis is in there, and Commoratio (especially at the creature's first enlivening).
Maybe you need some help in identifying "rhetorical devices". The following link is an excellent link that identifies 50 different types, with examples! It should help you to find at least two examples in the novel.