Sorry, but Gohan can become Operpowered if you'll do this in Namek. Less than 10 hp use dende healing in Gohan, do it 2 times if you'll find the other Namekian Child. After battle, go to rest to restore their healing abilities. Repeat process as much as you'll like but don't max out Gohan's level. Congratulations, you make Gohan become Mistic Gohan at his young age.
2nd Phase: Buy as many healing cards and at least 1 battle point power up before fighting frieza. Better if it's the highest one. 3rd phase: Let Ginyu Body change a 2nd time but to Chiatzou. Body change will become handy later. you can try a 2nd time or more if you'll find body changers before Frieza final battle. 4th phase: Story changed!? Do more get the Moon Card. Phase 5: After increasing Gohan over SSJ Vegeta in BP, max his level. I don't remember well if it increase bp more by using healing or items, but I know the closer Gohan to his max level, the more BP will get with the namekian healing abilities. Before Goku shows up during final battle, use your best BP booster on Gohan and Moon. Then, use body change on Frieza final form.
