GeoGreymon

GeoGreymon is a Dinosaur Digimon. He is a subspecies of Greymon. His name originates from the Greek prefix geo, meaning "earth", and grey, a misspelling of "great".

His appearance is similar to the original Greymon, but has different markings, has a tensed-up look, has far more teeth visible, and spikes on his arms. He also sports a re-designed muscle structure, including a more defined chest which lacks the blue stripes of Greymon.

Digimon World Data Squad
http://digimon.wikia.com/wiki/User:Maitkarro/DW_Data_Squad#GeoGreymon

Digimon World DS
GeoGreymon appears digivolving from Agumon and digivolving to RizeGreymon with Lv 29 and Dragon EXP2000. RizeGreymon not digivolution in game.

Digimon World Championship
GeoGreymon digivolves from Agumon with 20 Dragon AP and 6 battles, and will digivolve to RizeGreymon with 10 battles, with 50% won, MetalGreymon with 40 Dragon AP or Mammothmon if you pass time.

Digimon World Dawn and Dusk
GeoGreymon digivolves from Agumon, and can digivolve further into RizeGreymon with Lv35, Dragon EXP2500 and Machine EXP2500.When competing to reach the legendary tamer he appears in one of the fights with the Peckmon and Gaogamon.

 Attacks Attacks in Digimon World Data Squad  Variations / Subspecies
 * Mega Flame: A stream of flames are spewed forth from his mouth.
 * Mega Burst: A blast of powerful energy is forcefully ejected from his mouth.
 * Horn Impulse: A powerful, high-speed smash with his horn.
 * Mega Shot: A shockwave attack from his mouth.
 * Mega Roar: A battle cry shockwave attack.
 * Mega Volcano: A stronger version of Agumon's Baby Volcano.
 * Greymon