gear 4th snake man is very easy to get all you need is a fruit good for bosses
the hard part it's a 1% drop its not tradable nor any other rubber scroll and to even get it before gear 2 you won't be able to use it this is why: to get the form you'll need bound man wich you neeed to do gear 4 raids to get then youll also need gear 2 which is a 1% drop from Luffy this form in the anime was used by Luffy in his fight with katakuri gear 4th snake man or suneikman in japanese is over power in pvp but it sucks for grinding gear 4 bounce man on the other hand is better for both (my opinion)