>>38514643You can make it with seals and sea lions.
Water dark sea lion, they fight mostly by bodyslamming and being ruthless demons, 40% of males don't survive their first mating seasons that's how harsh their fights are.
Seals like the elephant seal are seen training and using tactical terrain advantage, size of the bull isn't everything as one of the most notorious beach master bulls once reigned for 7 years on a size disadvantage out of sheer tactics alone taking on opposing bulls with almost a third body size advantage.
You can make a dark fighting sea lion with ease or a water fighting sea lion using sumo moves or aura sphere from its modified nose.
Mexico and Guatemala have the scorpion lizard, despite bring venomous this lizard wrestles it's peers and wins by pinning down other males to defend its territory, so we have a quadrupede wrestling lizard already.
Alternatively you could make a grass or normal fighting Moose akin to the swords of justice.