ドカモン
From Appmon Chip Reference Book:
Rowdy by nature, fighting against strong opponents fires it up. Possessing great physical abilities as well as a sturdy fist, it always seeks for opportunities to test its power. 

Anime version: 
I'ma punch your body in with a bam!
Eri's Buddy Appmon. It has the personality of a gentle giant.
An action game app Appmon.
It loves Eri. It respects Gatchmon as its "Aniki". 
dokamon