Help with Xaldin data battle?

I have completed all of the data battles except Xaldin and Xemnas, and I am really really stuck. I can last a good while against him but I'm finding it really hard to land many hits on him. I can't seem to catch the Learn reaction command, or if I do I get hit straight after and it doesn't come up with Jump. Or if I do get Jump, it completely misses when I activate it. I've seen videos as well where people manage to stack the Jump commands but I always get interrupted before I can. I can't seem to find a good walkthrough for it either. Please help it's driving me crazy :(

 

Thank you I've managed to beat him now :) But yeah that's the technique i used in the end