Kakkinmon

Kakkinmon (カッキンモン)
A Digimon whose hat has become a copper shield, with its personality turning rougher as well. It is less vigilant than before due to its equipment becoming sturdier, adopting a fearless, forward-charging personality. However, because its shield is still only made of copper, it will land itself in trouble if it gets too aggressive. Its Special Move is striking at the opponent with the sharp corners of its shield (Kankan).

Etymology
Kakkin: (恪勤) means to "to work diligently". Kakkin (カッキン) can also be an onomatopoeia for a clanging sound.