Upon his return to the past, Trunks is able to attain Super Saiyan 2 and can now also use his father's signature techniques, such as the Galick Gun and Final Flash.
3 Future Trunks: Can Use The Galick Gun & Final Flash
He shocked fans with his repeated use of Vegeta's Galick Gun and Final Flash, a sign of just how much he respected Vegeta. Kid Trunks, on the other hand, has never been seen using either move (though his Big Tree Cannon is very similar to Vegeta's Final Flash).
Future Trunks also uses the Final Flash during the battle with Goku Black and Future Zamasu in the future timeline; however, Future Zamasu emerges unscratched from the attack, due to his immortality.
He performs it in super. Probably during the cell saga where he trained in the hyperbolic time chamber with vegeta.
All else equal, the Final Flash is more powerful than the Kamehameha. But the reason behind that power difference is almost entirely based on the amount of time Goku and Vegeta invest in building up their power for their attacks.
Final Kamehameha does hit hard and is one of the strongest beam attacks but it's still nowhere near the damage potential of x100 Big Bang Kamehameha. Any atk up super souls will.
Clearly, training with Vegeta allowed Future Trunks to take in essence of God Ki into his body, allowing him to transform when the time came. On the other hand, the God Ritual needed to be done for Goku so he could gain God Ki.
Future Trunks not only discovered how to tap into the powers of Super Saiyan 2 all on his own, but he also mastered a Super Saiyan Rage transformation that enables him to compete with someone as strong as Super Saiyan Rosé Goku Black.
The Omegaheat Magnetron is a powerful move used by Jiren during a critical point in his battle against Goku, who had perfected his Autonomous Ultra Instinct up to that point.
The duo proves to be formidable, with Zamasu using his restorative powers to heal any damage taken by Goku Black, triggering the latter's Saiyan cells and giving him a dramatic power up each time.
Trunks first appears in chapter #331 The Young Boy of Mystery (謎の少年, Nazo no Shōnen), published in Weekly Shōnen Jump magazine on July 15, 1991. Here he is a mysterious seventeen year old capable of transforming into the Super Saiyan state, who appears and singlehandedly kills Frieza and his father, King Cold.
After his battle with the Cell Jr's and being killed by Super Perfect Cell, Trunks is revived giving him a significant zenkai boost. Trunks is easily able to destroy 17 & 18 and even Imperfect Cell in the Future Timeline.
Vegeta didn't use Grade 3 in the main fight against Cell because he knew of the downsides, but knowing the form as he did, he would have been able to recognize that Grade 3's speed deficit would not have come into play when his plan switched into charging an ultimate attack for Cell to take head on by tickling his ...
Dr. Raichi – Vegeta blows him to bits using the Final Flash. Just as he puts himself back together, Vegeta obliterates him with another fierceful energy blast and this time, he crushes his last remaining cell to ensure he does not come back.
The Final Flash has more attack power but no one can deny that the Galick Gun technique looks way cooler. While the Final Flash has a somewhat unique charging pose with Vegeta having both arms pointed out before putting both palms together and unleashing a yellow beam, Galick Gun goes the extra mile.
Super Saiyan Rage is a unique transformation ability achieved by Trunks utilizing the "power of rage" (怒りの力, ikari no chikara). In this form, Trunks is referred to as Super Trunks (超トランクス, Sūpā Torankusu).
While this Trunks was able to transform into a Super Saiyan years earlier than his divergent timeline counterpart, Gohan consistently outpaced him as he reached new power levels, as seen towards the end of DBZ into the sequel anime series Dragon Ball Super.
Xeno Trunks is astronomically more powerful than the Future Trunks most know, and has even managed to cross into the realm of the gods. In Super Dragon Ball Heroes: Big Bang Mission chapter 1, Goku and Vegeta are introduced to a version of Trunks from an alternate dimension.
After becoming a God of Destruction candidate, Trunks became even more powerful than ever before to the point of gaining all the abilities of a God of Destruction. It is stated by Beerus that Trunks has the potential to become just as powerful as he is.
Gohan's strongest power transformation is Gohan Beast, an evolved form of Gohan's Potential Unleashed state which originated from the awakenings he has experienced since childhood.
The remnants of the Saiyan Royal Family on Earth. While officially no longer a recognized group, the bloodline is continued in Vegeta's descendants — his son Trunks and his daughter, Bra. In the anime-only Dragon Ball GT, the bloodline continued still further into the future, with Vegeta Junior.
Galick Gun (ギャリック砲, Gyarikku Hō) is an Energy Wave that is one of Vegeta's signature attacks, similar to the Kamehameha.
Having given his all to win the energy clash, Goku's arms go limp from the power output, but he presses his advantage with a kicking barrage backed by his Kaio-ken, sending the mutated Zamasu plummeting to the ground.
During his climactic battle with King Piccolo, Goku resorted to using a One-Handed Kamehameha to launch himself into the airto finish Piccolo with his Penetrate! technique. In the anime, Goku fired the One-Handed Kamehameha in an attempt to stop Piccolo's attack prior to this event.