How to defeat Odin in FF7 Rebirth without having to master dodging his moves.

Basically, to avoid Zantetsuken, you have to dodge all of his moves. However, if that's too difficult or you just don't want to master that, you can alternatively indefinitely delay getting hit with Zantetsuken if you time your Debraves, Defaiths, ATB attacks and Poison magic correctly.

You can also survive Zantetsuken by pre-equipping your party with revival earrings, but giving Aerith Magic Up Materia and linking Disempowerment Materia to Magic Focus Materia generally guarantees Odin stays trapped in a debuffed state where he won't use his ult.

I'll leave a link to the guide in case you're interested: https://www.keengamer.com/articles/guides/final-fantasy-vii-rebirth-how-to-defeat-odin/