My favorite Digimon is Wargreymon. However, he didn't start as that, but as Koromon. He then digivolved into Augumon, a fire breathing lizard, to protect Tai from Kawagamon, a big bug that attacked them. Soon after, they met Shellmon, a water digimon with a bad temper. Augumon then digivolved again into Greymon, a fire dragon with killer breath. He then made short work of Shellmon, but couldn't stay as his champion form and went down to Augumon.
Many moons later, they discovered that they could digivolve again with their crests and tags. They found their tags at the bottom of the ocean. One by one, the digidestined found their crests. Tai's was the Crest of Courage. Tai wanted to make Augumon digivolve right away, but when he tried to while fighting another Greymon, Tai's impatience made his Greymon digivolveinto Skullgreymon, the evil evolution of Greymon. This was very bad. All the other champions couldn't even faze him. After causing much damage, Skullgreymon reverted back to Koromon.
When they met Etemon, who had caused them much sorrow, Tai and Augumon had regained their courage and decided to try to go to ultimate again. Their courage let Greymon digivolve to Metalgreymon, the metal-plated monster who defeated Etemon. His blast caused a black hole that sucked Tai and Koromon(he dedigivolved after beating Etemon) back to the real world.
After Tai and Augumon returned to the digiworld, they discovered that their troubles weren't over yet. They now had to fight the evil Myotismon, a super-strong digimon that even an ultimate couldn't defeat. When Myotismon went to the real world to try to locate and destroy the eighth digidestined, Tai's sister Kari, they followed him to try to save the eighth child. When Myotismon captured Kari, Tai and friends had their digimon all go to ultimate in an attempt to defeate Myotismon for the last time. Things looked grim when Kari's digimon, Gatomon, digivolved into Angewomon, a angle with a powerful attack. Angewomon used her Heaven's Discharge to restore the other digimon's power. They then shot into one place and Angewomon used her Celestual Arrow to destroy Myotismon. But when the smoke had cleared, is seemed that things were just getting worse.
Myotismon had digivolved into Venommyotismon, a towering giant with an attack that can ahnialate anything. Gabomon and Augumon digivolved into Weregarurumon and Metalgreymon to hold him off. When they were forced to go back to rookie, Tentomon explaned the message that Izzy recived from Geni. Basicly it said that Angemon and Angewomon, T.K.'s and Kari's digimon, had to shoot Matt and Tai if they were to defeate Venammyotismon. After a short, slighty '''confused''' scene, they fire and give Augumon and Gabomon the ability to Warp-digivolve into their Mega forms, Wargreymon and Metalgarurumon with their super powerful attacks, Terra Force and Metal Wolfclaw. They then defeate Venammyotismon and reverted to their In-training forms.