This is obnoxious. So I can only unlock everything on the Right side and get the Super Dragon balls by doing this Starting from the Kale decision? Can't jump in at the Roshi fight? They really making you do too much for too little
Use your ultimate and make him lose sight of you. This should give you enough time to power up to your next ultimate. Also if you have 4 power bars, use 1 to power up and ultimate. Use your ability to go sparking again and ultimate right after. Additionally, any time he's looking for you is a perfect opportunity to either power up or use any kind of dash attack. It will land 100% of the time since he can't see you coming.
I did it this way yesterday but currently i want to beat goku black story and i prefer to just practice and beat it without spamming ult. I just wasn't prepared for the difficulty. So for anyone else, just change your mindset and practice combos, game mechanics and then keep trying and learning til you make it