Your ally during this battle is: Goku.
Recommended level – 22+
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 too much, as Goku will fire Kamehameha’s fairly often, so even if you are under-leveled, he should be able to pull you through the battle.