The white khezu is weak to fire so use any fire wepon you have or maybe switch ur wepon so you do. The red khezu is weak to water so any water type wepon can hurt him. I'm gunna talk about the red Khezu. What you might need for the fight: Max pots,mega pots,and regualr pots,a bunch of auto bombs the ones that r timed to explode. When he is going in a rage mode count to 5 onethousand when in shock mode becuz if counted right it ends. If he does a body slam or isn't doin anything grab a bomb and place it under him and run so when you leave itll explode on him which will make some major damage. He will retreat to areas back and forth so bring a couple of antidotes so you can walk through the poison. If he jumps up and grabs to the celing run away from where he is because he will either do 1: Chase you and sooner or later fall off 2: He will drop acid from his mouth which might have an item so don't pick the item up till you think you have enough time to collect it. Bring a couple of power seeds and armour seeds or demon drugs and mega armour skin. Use one of each to be able to keep your attack up and ur defense up so you'll be nice and safe with a bit of protection. Use a max pot to bring ur health all the way to the end of ur screen and use well done meats to to keep ur stamina up. If u use a great sword when he does his mouth shooting electric attack when that passes u if ur close enough if his mouth is still near the ground run up and hit him in the face and roll to whatever direction oppisite of where u ran in to hit him in the face. Repeat if you can on his mouth if scars come up on his face that means you done 1/4 of the damage to him I think. so that is all good luck. Rate and comment plz.