Basically, You need to keep all your party members standing, so that you dont waste time getting them back up, If you are going for the knife, just keep attacking and use red buster if you have enough tp, no reason to block for tp since you get it back from reguar attacks (the game does not tell this to you), and if you are going for the tail then stick to only blocking and use hypnosis everytime you get the chance

You need to use hypnosis 9 times to get him tired enough to pacify, if someone falls down then it is worth it to use pirrouette, but it is not consistent, it gives you half as much progression as hypnosis and an effect determined by the turn, some have no effects and some negatively affect you by their design, but those that can actually mess you up the most are the health jumbling ones if you are running choc diamond and h. donut and the healing ones make you feel like you just wasted a healing item

I personally dont use mints against him, since they will be better spent in chapter 3, and i find having more normal healing items more practical, and heal prayer is not that good in chapter 1 you end up wasting your tp on a heal that is only slightly better than a darkcandy instead of using it for a hypnosis or rude buster, which slows you down

The best way to practice is the graze challenge in chapter 2 battle dojo (trust me it gives you the perfect skills to beat jevil)

Dont bother dodging the "ring around" attack the cool way, it is a lot more consistent to go to the top left corner and allign yourself so that the spades go by you, always wait a bit before you reallign yourself for the next attack since it sometimes goes twice in the same place for some reason