how to qequip genon sark

level 95 bouncer, phantom, techer..

still can't equip with any combination... what class/gear do i need to level up/obtain to use the jet boots genon sark

If you can't equip it, then it is likely because you don't have all of the lv75 Title Bonuses that give bonus TEC-Def. The easiest option is just to get Summoner to lv75 as its Title Bonus gives 40 of each DEF type.