Fusion

Fusion Dance: This technique is done by doing a special dance. Two people must know the dance to fuse, and the fusion lasts only 30 turns. Your speed, power level, and stamina comes together. Your power levels also must be exactly the same, so learn Suppress first. You two must be the same race, or if that other person is a half-breed they must have some of the racial blood that you do as well. Example: A Human/Saiyajin can fused with a Neko/Saiyajin.

Poratta Ear Rings: One of the pair needs a set of Poratta ear rings, each of the two wears one, and then they fuse, permanently. Your speed, power level, and stamina comes together. Race and power level doesn't matter.

When you transform into one of your forms in the fusion, you have to look and see what forms the weakest person of the fusion has. If they don't have any forms, you can't transform, if they do, you can transform into it. (If you have Super Saiyajin 2, and the weak person of the fusion only has Super Saiyajin 1, you can't go Super Saiyajin 2.)
But if you only have Super Saiyajin 1, and the weak person of the fusion can go up to Super Saiyajin 2, you CAN go to Super Saiyajin 2.