Get Super Electric Strike from the PQ where you fight the Androids. Spam the hell out of it, it will literally catch 3 or 4 enemies in it everytime. I beat the entire thing with Bardock still over 75% health.
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Yes, I had to get the dragon balls to re-spec my character to be a pretty much Ki super user, maxed out 100 ha, that's how I did it, super vegeta 2 helps too