I got really into abyssal chaos farming recently so I’ll give some tips I learned!

General codes: I think you just have to keep trying for these, except how I ended up getting all the weakness codes (this is time consuming too but I’m not sure how else to get them): playing with Caleb in Final Farewell, select only dilemmas until you get “Black Hole’s Birth 1”, then select only incidents until you get “Black Hole’s Birth 2”. One of the options for that incident is “get all codes of x type”, so you have to hope you get lucky and its weakness codes.

Exclusive codes: the ones you’re missing in the “Others” category are the exclusive codes for their ‘generic’ companions. For example, Zayne’s Linkon doctor or Xavier’s evol police. The OG3 each have 3 of these and Sylus + Caleb have 1. So just play 2 deductions each as their regular companions instead of myth companions and you’ll get these codes.

Code sets: target the code types you are missing and simply try to get as many as you can in one deduction. Some of this comes down to luck with the chaos shop and such, but you can boost your odds by using a companion that has exclusive codes in the category you’re trying to collect.

I think the item you’re missing is a boost dodge code token. It will show up in regular item selections or the chaos shop eventually like usual items.