This is another 2v1 fight against Frieza. He, and Goku, will be at full power here, so both of them will be throwing around energy blasts a lot.
This fight will require you to be cautious and patient. Let Goku take some hits from time to time, and if you can bring a health item or two, do that. Fortunately you shouldn't struggle to much, as Goku will fire Kamehameha's fairly often, so even if you are underleveled, he should be able to pull you through the battle.