I don't have the save I did this fight on anymore so I won't be doing the other data fights anytime soon. Opted for Kindom Key cuz it feels cool to use despite it being weak.
First phase is breeze, have negative combo equipped and make sure to reflect when the revenger counter ticks over. I prefer to gaurd over parrying to start combos since I'm more consistent with it.
2nd phase is a bit trickier with the added pillars of light on some moves limiting your movement and making his circular attack unblockable unless you use reflect. I play more defensively and wait for him to use his flurry attack to make an opening. I also pop limit form out starting this phase to abuse invul frames and get a free heal if I'm being dogged on too much.
Phase 3 is more of the same from the 2nd phase but now Roxas does the full combo where he spins his keyblades around and homes in on you. He does in this in phase 2 as well but it's way mroe troublesome here as it lasts longer, and can easily catch you off gaurd if you aren't ready for it. His reaction command also comes into play here, it's not too difficult and you can juggle him a lot more if you do it right. Also regarding that, I'm proud of the sequence around 4:32. Went hard.
I don't have the save I did this fight on anymore so I won't be doing the other data fights anytime soon. Opted for Kindom Key cuz it feels cool to use despite it being weak.