Battle Arena - Last battle

as above, any tips on that? full of metallo and i only have flamogun with metal slash

party around lvl 70-75

do have other low level arks with metal slash like frostknight and naga

Level up those with metal slash, also I have found that abilities that shuffle your opponents lineup can be very very useful in this fight if your lucky you can get large groupings of metallos to metal slash, and lots of non metallos to kill with normal means without all of the metallo interference. Also don’t forget to make use of stun and haste monsters so you don’t take nearly as much damage and use those first ones when your able to summon one to soak up some extra damage and deal some as well.