>almost successfully killed Giratina and tried to kill a Shaymin, Ash & co, erase a whole town with a glacier crashing into it, become the ruler of the Alternate Dimension and travel between it and the real world
>I can fix him...
Six years prior to the events of the movie, Zero wasNewton Graceland's student in researching theReverse World. They discovered a way to travel there, and after meetingGiratina, they decided to find a way to obtain Giratina's power for themselves. This led to Newton inventinga devicethat could copy Giratina's powers, but when he realized using it would inflict fatal damage on Giratina, he deleted the design plans despite Zero's vehement disagreement. Following their falling-out, Zero went out on his own and reconstructed the Megarig from what he could remember of the lost blueprints.
In the ending credits, Zero was freed by Newton andOfficer Jenny. Newton extended a hand to help Zero out of the aircraft, and after being stunned for a moment, Zero smiled and accepted it.
Zero made a cameo appearance in the credits ofArceus and the Jewel of Life, where he was in prison for his earlier crimes. Newton came to visit him and revealed he was in possession of a salvaged copy of Infi, which Zero was happy to see.
Zero is brilliant, but troubled. He is emotionally unstable, obsessive, and narcissistic, simultaneously seeing himself as having a righteous cause in protecting the Reverse World but also viewing himself as its king. For most of the movie, he is calm and conducts his plan with great confidence, but as he encounters mounting opposition, he gradually loses his composure until he is reduced to a screaming, maniacal wreck. After realizing his defeat, however, he eventually accepts his fate with dignity and willingly goes to prison, where he is later seen to have recovered significantly.
