Follow the steps below to have easy wins as Goten. (Only)

Ginyu: He is a big energy user. He will use his special blast when he has low energy. Wait until he sounds like he is saying "Hot Sauce", then throw him and use your special blast.

Gohan: Dont try jumping over him because he can uppercut you. Instead, wait until he powers up, then throw him up and use special blast.

Goku: Wait until he uses the Elbow Smash, then throw him and use special blast.

Goten: Fly into the air and wait until he jumps in the air and looks as if he is flying further into the air. Run under him and when he lands, throw him.