Digimon Adventure (movie)

Two children receive a strange egg through their computer, which hatches into their very first Digimon, leading to the night that would change their lives forever.

Synopsis
In Highton View Terrace, Tokyo, two children named Taichi "Tai" Kamiya and Hikari "Kari" Kamiya are awoken late at night when a strange egg comes out of their computer. The next morning, Tai cannot believe his eyes when he realizes the egg is real. While their mother is out, the egg seems to develop a mind of its own when it escapes Kari's grasp and rolls away. It then hatches into a Botamon and immediately latches onto Tai's face. Tai throws it off, and it runs under the nearby bed. Kari eventually gains its trust with her whistle and begins feeding it chocolate, causing it to digivolve into Koromon.

Now out of food, Kari steals the food belonging to their cat, Miko, and gives it to Koromon, who thanks her by latching onto her face as well. Miko soon finds Koromon with its food, however, and lashes out. Tai tries to protect him and, soon after, Koromon introduces himself. He tells Tai and Kari that he is a Digimon from the Digital World. They don't really understand this and later head to bed, but Koromon suddenly digivolves into a large Agumon and begins roaming the streets, causing destruction on a small scale, while carrying Kari on his back.

Before he manages to cause any real casualties, a Parrotmon appears out of a huge egg in the sky. Agumon lashes out, which only angers the bird, causing it to destroy an overhead bridge and covering Agumon and the two kids in rubble. Out of the rubble, Greymon appears in Agumon's place and begins fighting back against Parrotmon. After a few minutes, Greymon is knocked out, and only awakens when Tai blows Kari's whistle as loud as he can. He then lets out a blinding fire breath attack, and the two Digimon vanish, leaving Tai and Kari alone amongst all the destruction.

Digivolutions
(Number indicates order of occurrence.)