A potara is a pair of special earings in Dragon Ball Z that are used to fuse.
Red potara is a type of potara that makes your character super powerful, but is only accessible through a particular code
Fusion is stronger because when you use the potara you can't turn Super Sayain, but with fusion you can
red potara passwords are the passwords that give your characters special abilities like more health bars
on tag battle be goku and vegeta and fuse you may use the potara ear rings
Only the red potara characters can give them to you. You have to look up the codes and you can not put the earrings in another character. Hope it helped.
Potara Fusion
14 at a time
You fuse by doing the fusion dance or using the potara earrings.
they allow stronger and permanent fusion.
Vegitto - was born by the potara fusion technique. Gogeta - was born by the fusion dance technique. Vegito is goku and vegeta fused with potara earrings. Gogeta is goku and vegeta fused with fusion dance.
The answer is simply, you can't. You'd be winning everything if you could. >.<
When Vegito was eaten by Super Buu, the stomach acid dissolved the magic of the Potara earrings.