Dasher is the first born son of the two original Mewtwos, one whom was created by team Rocket, one whom was created by unknown scientists, who had stolen the research from team Rocket's forgotten files. Dasher was nicknamed so due to his habit of using his legs to run to places instead of floating like his parents and sister. Dasher grew up with his parents constantly reminding him and Ruby of the dangers of humanity, and after Dasher and his siblings were old enough to learn of the origin of their species, and what horrors their parents had to endure, his hatered deepened. When his younger brother started to flirt with the idea of studying humans, Dasher was mad, thinking his brother would endanger the whole family with his "dumb ideas". The two often clashed due to their ideals, but deep inside Dash just wanted to protect his family from harm.

Captured

Some time after moving to Kanto, Dasher was challenged by a young boy named Red. Dash and Red's Charizard had a long and furious fight, trough which Dasher got most of his scars from. In the end, Dasher was caught by the boy and put to a PC box. Dasher was anything but happy about this and used all of his power to get out, but nothing seemed to work. Thus he started to call his parents and siblings for help telepathically. Spending time alone in the dark confinement of the digital realm caused Dasher some deep rooted issues, but finally he was released for this personal hell but Red, thanks to Jonathan's trainer Penelope. Dasher was imidietly embraced by his parents and siblings when he got out, and Red even apologized for holding him against his will, saying he would release all his pokemon and only keep those who wanted to stay. But Dasher didn't answer to the boy, feeling conflicted and a little scared. He then hears about Jonathan having a trainer and grows furious, mostly due to jealiousy, as Jon's trainer caught him with his own concent. Dash returned to Unova with his parents and isolated himself further away from humans, scared of being captured again.

Ruby's pain, Holly's capture

Some years later Dasher along his family start getting nightmares of Ruby being held captive. Dasher, Jonathan and the rest of the family start making their way to Oblivia to save her, Dasher ready to throw hands to save his twin. They don't reach Oblivia before Ruby comes to them, as she was just freed by another human. While the rest of the family comfort her, Dasher wants to go back and take revenge, trying to rilu Ruby's hatered up, but the rest of the family tell him off. Ruby moves to Mt Silver some time later, and Dasher stays with his parents, still seething with hate towards humans. Catching him? Lucky strike, he could take it. But hurting his sister? Humans had to pay. He just needed one more push... And that came years later when Holly too was captured and the Ryme city incident happened. This was enough for Dasher to believe that all humans were just as bad, despite the clear proof to the contary. Dasher wanted to make the world safer place for his family, and he would go far and beyond to make this happen...