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 design, 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 digivolves from Agumon, and can digivolve further into RizeGreymon depending on its stats.

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.

 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