Genesis

Well aiming for his back is a good bet since it gives you a critical hit.also using buff spells like magic barrier,barrier,and regen help too

Gensis has like 14800 hp in normal mode in hard mode 32100 hp equip hell thundga and dash so you can run away fast when he actvatscant rember the name but he sommons three ballsof energy or something and also eqruip high vit and atk I hope this helped.

Sorry about the last one I spell alot of them wrong. Gennsis has like 14800 hp in normal mode and hard mode 32100 hp equip hell thundaga and dash so you can run away fast when he actavite I can't rember the name but it's like three energy balls or something and also equip high atk and vit. The last one I messed up so ingnore the one I made. I hope I helpd

Well, I had firaga (3 fireballs if you didn't know) at master level, so I just used that repeatedly, each fireball that hit him took off abouut 1,200 hitpoints. Also, the only one of his attacks you really need to worry about is the one where he summons 3 balls of magical energy, to avoid it, just keep running in a circle and they'll miss you completely.

Hope I helped

I was level sixteen when I beat him, this is what I did:
When he came to attack I would run away and when he got close to me I rolled away. Then he would stay still and I would use assault twister behind him 2 times. I also had hi-potions and cura and m-barrier