Greymon

Greymon (Vaccine)
Greymon is a dinosaur digimon, more closely modeled after the classic, flat-footed, upright depiction of a theropod dinosaur. It has a well muscled chest and forearms, orange skin with blue stripes, and a brown helmet with antler like horns on the side and a single horn on the nose - making it resemble some sort of fusion between a Allosaurus and Ceratosaurus. It is approximately 15 to 20 feet tall.

Our War Game
In Our War Game, Agumon became Greymon to fight Infermon, who had digivolved from Keramon. Infermon prevented him from digivolving to MetalGreymon.

Digimon Adventure V-Tamer 01
In the Digimon Adventure V-Tamer 01 manga series, a Greymon worked in Hospitown with two Centarumon and a Meramon. They helped to take down Tuskmon when he and Cyclonemon raided Hospitown.

Another Greymon was an old partner to Neo Saiba, who threw him away and became MetalGreymon.

Digimon Next
Tsurugi's partner is a special Greymon that has the symbol of a hexagon on his left arm, indicating that he is an Illegal type, a Digimon that can save the Digital World. He first appeared to fight a Kuwagamon that appeared in the Real World. When it came to Greymon about to be finished off by Peckmon, Piximon De-Digivolved Greymon to Agumon.

Digimon World
A Greymon can be fought in Jijimon's house, and if defeated will join the players town and hold multiplayer Tournaments.when you walk out

Digimon World 2
Greymon digivolves from Agumon, and can digivolve to MetalGreymon, MasterTyrannomon, or SkullGreymon. It can also be found with Apemon and ShimaUnimon on the fifth or so floor of a domain after the first Blood Knight attack.

Digimon Digital Card Battle
Greymon is the last opponent in Beginner City's Battle Arena after you beat A. He is a Red Card.

Digimon World 3
All of the starter Digimon can digivolve into Greymon. He is also The most powerful Digimon card. It is a red Champion Digimon card with 20/20.

Digimon World DS
Greymon digivolves from Agumonat level 15 and 60 fondness, and can digivolve to MetalGreymon at level 25 with 80 fondness.

Digimon World: Dawn/Dusk
Greymon digivolves from Agumon, and can digivolve to MetalGreymon. Greymon can be found at Task Canyon.

Attacks  Attacks in Digimon World: Dawn/Dusk Variations / Subspecies 
 * Nova Blast (Mega Flame): Fires a giant fireball from his mouth.
 * Horn Impulse: Rapid, repeated strikes with his horn.
 * Great Horns Attack (Great Antler): Slashes enemies with his horns.
 * Great Horns Bash (Great Horn Attack): An upward ramming with his horns.
 * Grey Tooth: Bites enemies with his razor sharp teeth.
 * Tail Crash: Pummels enemies with his tail.
 * Middle Tackle
 * Dramon Claw
 * Mega Napalm
 * Double Dramon Claw
 * Greymon (Blue) / GeoGreymon
 * Greymon X

Greymon (Virus)
The blue Greymon is a virus Digimon, and is also known as BlackGreymon. It made its debut in the card game, and has appeared in at least three video games.

Digimon D-Project
A bluish virus version of Greymon can be seen on the Digimon Dictionary.

Digimon Rumble Arena 2
BlackGreymon is the digivolution of BlackAgumon, and can warp digivolve into BlackWarGreymon.

Digimon World Data Squad
Greymon (Virus) is an unlockable digivolution.

Attacks  Variations / Subspecies 
 * Mega Flame
 * Great Antler
 * Greymon

Greymon X
Greymon X is a Greymon modified through the X-Antibody.

Attacks  Variations / Subspecies 
 * Mega Burst
 * Great Antler
 * Greymon

Digimon Adventure (The Movie)
In Digimon Adventure (The Movie), Agumon digivolves to Greymon to fight Parrotmon. In the movie, this particular Greymon is referred to as "RedGreymon", and its stance and design are both much closer to that of true theropods.

Attacks 
 * Nova Flame (Mega Flame): Shoots a flamethrower out of his mouth.