

When Trunks arrived from the future, he was easily defeated by Goku and
Vegeta. His strongest form is SSJ2 (or Possibly USSJ in the anime). This form
at best is on par with SSJ3 Goku.

When Goku, Vegeta, and Trunks go back to the future, Goku Black knocks out
Vegeta, who is in SSJ Blue form, easily. Then, Goku is also handily defeated.

Despite this massive power difference, Trunks steps in and fares far better
than either Vegeta or Goku. How is this possible?


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dragon-ball-series dragon-ball-super
How is it possible for Trunks to fight with Goku Black, and hold his own better then either Goku or Vegeta?


Dragon Ball is known for inconsistencies and plotholes so it might simply have
to do with something of that. But aside of that, some reasonable arguments
I've seen online are these 2, each time a saiyan is knocked down it gets a
senkai boost when it recovers (increase in his power) . He was knocked down
two times, by Goku and Vegeta. In the manga, when he is fighting against Goku,
he is said by Vegeta to be almost as strong as a Super Saiyan 3 . It is
possible for a Super Saiyan 2 to be as strong or stronger than a Super Saiyan
3, Beerus says Vegeta (in Super Saiyan 2) made him use more of his power than
Goku (in Super Saiyan 3) when fighting against him. After fighting a Super
Saiyan 3 (Goku) and being knocked down, he recovers as a saiyan to catch up
his power, and later he is knocked down by a Super Saiyan Blue (Vegeta), and
he recovers as a saiyan to catch up his power. So the argument says that when
he might not be as strong as a Super Saiyan Blue, he might not be as far of it
as for being unable to step in fresh by surprise in a fight, and score some
succesful punches


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This isn't very clear in the Anime but in the manga it's pretty clear that
[SSB has a major
flaw](http://dragonball.wikia.com/wiki/Super_Saiyan_God_Super_Saiyan):

> In the Dragon Ball Super manga, the form is noted to have a major flaw in
> its stamina. If the form is subsequently used multiple times in a row, the
> user will be unable to exert even 10% of their power...

This may or may not have been a factor.

Also Trunks notes that Black is as powerful as himself in SS2 form while in
base form. This is useful to note here for 2 reasons. 1 it shows that Black is
stupid strong, and 2 it shows that form isn't everything. It really depends on
the base powerlevel of the person fighting.

Goku for instance didn't have to go SSB to stay even with Black until after
their first fight. He was essentially even with him in SS2 form in the
'current' timeline, where Trunks got his butt kicked in that form.

Finally Pablo has a point, and it can even be seen in this instance. Fighting
and getting beat makes Saiyans stronger fast. Black got stronger then SSB
Vegeta from one fight with Goku. Goku went Super Saiyan the first time _after_
being pummled by Freiza. It's not unreasonable by Dragon Ball standards that
Trunks getting his butt handed to him by Black also made Trunks much stronger
for the very next encounter.

Having watched the entire arc I can now say for sure:

  1. Transforming into blue multiple times played a big role.
  2. Keep track of the sensu beans, Trunks gets an extra one. For Saiyans in the middle of a fight a sensu bean is basically a +1 level.
  3. Goku and Vegeta _do_ generally fight on par with Black. Problem is, is that he +1's without sensu beans and he has an immortal partner. Really without Zamasu there who wasn't that strong comparatively - Goku smashes his head into the ground 10 or 12 times - but could be a shield _and_ blinder against attacks. Black would of gone down 2 different times to either Goku, or Vegeta.
  4. Rage plays a huge part in it. Vegeta gets stronger when he's pissed and thinks Trunks might be dead, Goku would of blown them both up when he hears what they did to Chichi if one of them isn't immortal, and Trunks final strength gain comes from being pissed off from being told protecting his loved ones is a 'sin'.
  5. > Finally, Trunks doesn't win alone, Goku started the meltdown, Vegeto continued it, and Trunks basically absorbed the power of a spirit bomb in the end to gain enough power to finally kill the crazy bugger. 


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It is clearly evident by what happens later in the story with Trunks' sword.
At some point Trunks obtained an ability very similar to the Genki Dama. While
it takes on a more physical form when he gets his sword back we actually see
his Super Saiyan aura incorporate a blue glow which could either be
reminiscent of the SSJB auras or the Genki from the Genki Dama. But we get
confirmation that Trunks sword was like Goku's Genki Dama from Goku himself.
Not to mention we see him take something from the people he is trying to
protect.

What is questionable however is how the Earthlings managed to power him up so
much when there weren't that many left.


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Here's a theory:

There are two Zamasu's. One from the past and one from the future. As the past
Zamasu gets beat up, the damage and recovery is instantly recognized by
Black's Saiyan body and increases his strength. Being a god, the strength
increases even more. He more than likely gained the ability to transform into
super saiyan rose by beating up his old self in a sparring match.


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