In the show, when Frieza kills Piccolo and Krillin, Goku snaps and goes SSJ.
When the game is in Teamplay mode, you should be able to choose one "Best Friend" on your team, which, when they die, would give you some sort of boost.
The boosts could be:
A permanent, but small boost of PL (Not a lot, just a little helpful boost, and it would be weighted by how much PL you would have gained if you had dealt the finishing blow, so someone at PL 600k would gain more than someone at PL 1.5M from the same character, so you can't just have a team "kamikaze" who just flies out to die.)
A temporary, but large boost of PL (Sort of like a massive boost from the Turbo function. It lasts as long as you have Ki, or a time limit set for the server.)
A quick boost to Ki or Health.
Faster charging for attacks for a short while.
When the game is in Teamplay mode, you should be able to choose one "Best Friend" on your team, which, when they die, would give you some sort of boost.
The boosts could be:
A permanent, but small boost of PL (Not a lot, just a little helpful boost, and it would be weighted by how much PL you would have gained if you had dealt the finishing blow, so someone at PL 600k would gain more than someone at PL 1.5M from the same character, so you can't just have a team "kamikaze" who just flies out to die.)
A temporary, but large boost of PL (Sort of like a massive boost from the Turbo function. It lasts as long as you have Ki, or a time limit set for the server.)
A quick boost to Ki or Health.
Faster charging for attacks for a short while.