An Earth Dragon Digimon with giant arms on its back. The arms on its back are said to be wings that mutated, allowing it to more efficiently dig through the ground. It usually lurks within the tunnels it carved deep underground, and seldom comes to the surface. Also, as Groundramon tends to prefer to inhabit veins of the rare Huanglong ore, it has been discovered that it is very likely to find the elements of Huanglong ore comprising the scales covering its body. Its personality is extremely ferocious, and as most people lose their life when they encounter one, it is one Digimon for which the details of its ecology are not well understood. Its Special Moves are holding the opponent between the arms on its back and crushing them (Scrapless Claw) and knocking them out with the iron ball on its tail (Megaton Hammer Crash). When it reaches the surface it uses "Giga Crack", which drops the opponent into fissures it generates by striking its whole body against the ground.

背中に大きな腕を持つ地竜型デジモン。背中の腕は翼が変化したものといわれており、効率よく地面を掘ることが可能である。普段は地中深くに彫ったトンネルに潜んでおり、滅多なことでは地表に出てくることはない。また、グランドラモンは希少なファンロン鉱の鉱脈に好んで生息する傾向があり、体を覆う鱗にファンロン鉱の成分を含んでいる可能性が高いことが分かってきている。性格は非常に凶暴であり、遭遇したもののほとんどが命を落としているため、詳細な生態が分からないデジモンの1体である。必殺技は背中の腕で相手を挟んでつぶす『スクラップレスクロー』と尻尾の鉄球で殴り倒す『メガトンハマークラッシュ』。地表に出てきた際には全身を地面に打ちつけて発生させた地割れに相手を落とす『ギガクラック』を発動させることもある。