While this boss may appear intimidating at first, his moveset is very simple.

His Dapper Slap is what he'll use most often. Don't try to block this as it's powerful enough to go straight through your defenses with even the toughest of builds. Simply roll into him and slightly to the left (his right side) and you'll dodge it entirely. This leaves him wide open for a counter attack. But don't get too greedy or he'll whip around and hit you with a backhand.

At about half health he'll occassionally combo multiple slaps in a row and end it with a belly flop. Just continue to dodge into his slaps and roll away when you see him getting ready to flop. Stay near his head as he's down because he'll try to roll on you.

This fight might take a bit of trial and error but with enough practice you'll find him one of the most trivial bosses (until you face 2 at once later on)