This guy requires you to rush due to the fact he will heal himself by 10HP out of every bite of food he woofs down.
Using the Super Monster Milk will allow you to deal 15HP (or high if you bought Hair upgrades)
And as always to get those extra hits out let's use a Pike Ball which for this guy let's not waste a Super.
In the video I hang behind him and deal quick damage... ONLY ONCE will you be safe as he doesn't back up the first time he sits in a corner. After that he pulls back to charge and you will take damage if you're behind him. The only reason I got behind him a second time is because I knew I was causing enough damage to end his first phase.
2nd phase his armor needs to be split with your scimitar however after that he is just his 1st phase but it's more aggressive.
Whenever he is healing it's safest to be in front of him attacking not behind because he will pull back if you don't delivery a killing blow.