It's in a pretty much 100% done state, unless I've missed something. Items, Z-Cells, Pokemon have all been checked for. Enjoy!
The walkthrough is made for, well, a player like myself - who tries to get all the items and Pokemon as early as they become available in the main story. Use this thread to talk about it - suggestions, etc. Without further ado - here is the link:
https://docs.google.com/document/d/1-Dk0g5bVs0B4JNuSR-f4AAFIeWQozHosKFS-wPao9bc/edit?usp=sharing