Pokemon Bonus Movie 1: Mulan is set in Nick Jr.'s China in the year 33 during the Han Dynasty. The film's protagonist, Eevee as Fa Mulan, is the Pokemon of a sick 11 year old Chinese Pokemon Trainer. Eevee transforms herself ito a human and takes her Pokemon Trainer's place during a general conscription to counter a fictitious Hun invasion led by Shan Yu (Cyrus). Along with her guardian dragon Mushu, her captain, Li Shang, a lucky cricket, "Cri-kee," and her companions, Ash, Lucas, Dawn, May, Brendan, Max, Brock and Misty, she battles the invading Hun army.
An Eevee transforms herself into a human so that she could fight the Huns in place of her sick Pokemon Trainer.
The Huns, led by the ruthless Shan Yu (Cyrus), invade NIck Jr.'s Han China, forcing the Chinese emperor to command a general mobilization. Each family is given a conscription notice, requiring Pokemon Trainers from each family to join the Chinese army. When Eevee hears that Su and Meng, the only Pokemon Trainers in their family, is once more to go to war, anxiety and apprehension grip her. Eevee decides to take matters into her own hands, by putting on the gui
se of a man so that she can go to war instead of her father. When her family learns of Mulan's secret departure, they are all very anxious. Su and her sister Meng, prays to their family's ancestors for the safety of her Pokemon. The ancestors then order their "Great Stone Dragon" to protect Mulan. The ancestors are unaware that the statue of Great Stone Dragon failed to come to life, and that Mushu, a small dragon, is the one to go and protect Mulan.
Mulan is initially misguided by Mushu in how to behave like a man, and starts a ruckus at the training camp. However, under command of May's Eevee, she and her new friends at the camp, Ash, Lucas, Dawn, May, Brendan, Max, Brock and Misty become skilled warriors. Mushu, desiring to see Mulan succeed, creates a fake order from Li Shang's father, General Li, ordering Li Shang to follow them into the mountains. They arrive at a burnt-out encampment and discover that General Li and his troops have been wiped out by the Huns. As they solemnly leave the mountains, they are ambushed by the Huns, but the clever use of a rocket by Mulan creates an avalanche which buries most of the Huns. Mulan is slashed in the side by an enraged Shan Yu, and her deception is revealed when the wound is bandaged. Instead of executing Eevee as the law requires, Li Shang decides to spare her life, leaving her on the mountain as the rest of the army departs for the Imperial City to report the news of the Huns' demise. However it is revealed that several Hun warriors including Cyrus survive the avalanche, and Mulan catches sight of them as they make their way to the City, intent on capturing the Emperor.
In the Imperial City, Mulan attempts to warn Li Shang about Shan Yu, but he refuses to listen. The Huns appear and capture the Emperor, locking themselves inside the palace. With Mulan's help, Yao, Ling, and Chien-Po pose as concubines and are able to enter the palace and, with the help of Li Shang, defeat Shan Yu's men. As Shang prevents Shan Yu from assassinating the Emperor, Mulan lures the Hun onto the roof where she engages him in single combat. Meanwhile, acting on Mulan's instructions, Mushu fires a bundle of fireworks rockets at Shan Yu on her signal and kills him. Mulan is praised by the Emperor and the people of China, who all bow to her as an unprecedented honor. While she accepts the Emperor's crest and Shan Yu's sword as gifts, she politely declines his offer to be his advisor and asks to return to her family. She returns home and presents these gifts to her father, but he is more overjoyed to have his daughter back safely. Li Shang, who has become enamored with Mulan, soon arrives under the guise of returning her helmet, but accepts the family's invitation for dinner. Earlier in the film, Mulan was declared unfit for marriage, but this is not the case with her budding romance with Li Shang. Mushu is granted a position as a Fa family guardian by the ancestors amid a returning celebration.
When the Huns, led by the ruthless (Cyrus), invade Nick Jr.'s China, each family is given a conscription notice. Mulan's father, Fa Zhou has to serve in the army, but due to his age and previous war injuries, is doubtful that he would survive. Fa Mulan disguises herself as a man, then takes her father's conscription notice, armor, and weapons so that he will not have to go. She rides away on her horse, Khan, to join the army, knowing that if she were caught trnsforing herself into a human, she would be killed.
Mushu (Eddie Murphy), a small Chinese dragon, has been awakened by the family's First Ancestor (George Takei). Mushu had been demoted to gong ringer after a mishap with one of the ancestors when the other ancestors were awakened. After various choices of which guardian to send after Mulan, he is asked to awaken the "Great Stone Dragon". Mushu accidentally destroys the Dragon but realizes that this could be an opportunity to earn his place among the guardians again if he can make Mulan a war hero.
Mulan trains with a group led by Captain Li Shang (B.D. Wong), including fellow soldiers Ling (Gedde Watanabe), Yao (Harvey Fierstein), and Chien Po (Jerry Tondo). The troops complete their training, but Chi Fu (James Hong), the Emperor's meddling and misogynistic advisor, refuses to let them see battle, accusing the troops of being ill prepared. Mushu forges a letter from the General, ordering Shang to take his men to battle. The troops set out to meet General Li (James Shigeta), who has already left on a mission. However, Shang and his troops discover that the General and his men were killed in battle.
Shang and his troops continue, disheartened by their loss, when they are ambushed by Hun archers. After an initial attack, the Huns are believed to be defeated, but the troops soon discover otherwise. As they are setting up the last cannon to fire at the Huns, Mulan spots a precarious mound of snow on the upper mountainside. As the Huns charge down the mountain Mulan takes the cannon and fires the rocket at the snow mound. The collision of the rocket and the snow mound causes an avalanche which spreads over the charging Huns, burying them. Shang's soldiers take refuge while Mulan rescues Shang from being swept away by the snow. The Chinese soldiers initially cheer for their victory, but quickly become somber after Mulan discovers that she is bleeding; she had been wounded by a swipe of Shan Yu's sword. Shang quickly summons a doctor just as Mulan faints.
During treatment, Mulan's true identity is discovered. Shang is notified and is expected to execute Mulan, but spares her life and considers his pardon an exchange for Mulan saving his own life. Instead, Shang expels her from the army. Mulan decides to return home but hears the Huns emerging from the snow that had blanketed them during the earlier battle. She tries to warn Shang's troops as they are heralded by citizens in a parade for their war efforts, but they do not listen. As the Emperor (Pat Morita) addresses the crowd, the Huns, disguised as parade characters, kidnap him.
Shang and his troops try to follow the Huns into the palace but are unsuccessful. Mulan devises a ploy with the other soldiers to dress as concubines, scale a palace wall and infiltrate the palace. When the Huns lower their defenses in the presence of the "women", Mulan and her friends swiftly dispatch them all. During this attack the Emperor is safely removed from the palace by Chien Po, but Shang and Mulan are both trapped on the balcony with Shan Yu. Shan Yu is about kill Shang when Mulan gets his attention. He recognizes her from the mountain battle and gives chase. Mulan lures him onto the palace rooftop where they face each other in personal combat, until Mushu, as arranged by Mulan, propels a huge firecracker that hits Shan Yu and carries him off to his death. The fate of the remaining five Hun warriors is never fully disclosed.
The Emperor meets Mulan and, in an accusatory tone, lists Mulan's crimes, but he pardons her. The Emperor then bows to Mulan, which is considered an extremely high honor as it implies being of a higher status than the Emperor, while the hundreds of observers kow-tow (an Eastern bowing position with one's face and palms to the floor). The Emperor then offers Mulan a position in his staff, but Mulan politely refuses the offer and confesses that she wants to return home. He gives her Shan Yu's sword, along with his crest, for her to bring home and give honour to her family.
Upon her return, Mulan expects to be reprimanded but is instead embraced by her family. Shang arrives to talk with Mulan, having been encouraged to propose by the Emperor. The ancestors reluctantly agree to make Mushu a guardian once more.