It's a long guide, which is to be expected, I didnt go too in depth on most boss fights, just stunlock any hard fights. This is the route used in wh0mis' WR run.

https://docs.google.com/document/d/1lnc7YCcu4O8R-2iERXmpdHiWRDvSPtJyw4Re_7rr274/edit?usp=sharing

Update April 20th 2020: updated guide to version 2, lot of changes have been made Update March 17th 2022: updated guide to version 3, because I forgot to update it earlier