Korg is pain in rear

The only thing problematic about him is his thorns when duped. Otherwise, he's simple to take down. Just don't hit his block and do shallow evades

When he uses his L1, start your evasion right before his foot hits the ground. Three evades and you're clear

Fixxx

A duped Korg just means you'll be hitting him with light attacks to get his rock shield down without taking thorns damage. MLLLL is what is the most intuitive to me--you will take thorns damage on the medium but the rest will be painless

Each time his shield is shattered, it returns with one less. He gets easier to deal with over time