For anyone who can't beat the clone fight,
DON'T train with Vados, U'll never win that way and U'll be killed in 2 hits.
I don't know about Whis, I haven't explored that option.
I used the "train by yourself" option, it gives u some new moves that u can use for good dmg. And ur transformations restore health, u can keep transforming, attacking, charging ki and transforming again (u lose transformation when ur ki goes down a bit). It takes a couple minutes but u can win it, quite easy once u figure out how.