What is the best way to defeat many metalos? What element? What type? Level? Anything!!! Thanks.
Metal slashers 
I thiiiiiiiink Naga has one, and you get him from PvP, does Flamogun have metal slash?
Great! I have both. Thanks so much. 
Well if u go into OM onsters, Scorpionix and Octoneer are two of the best metal slashers, octoneer having a triple and scorp having a double.
And your welcome i always try to help
Don’t forget Shadowlance. Very good metal-slasher and strong attacker
Nilox and ark wing I had that metals fight and I figured I use nova and supernova
Like the people above said,any metal slasher like shadowlance will work exceptional.
Only ever use elementless on these guys if you have no metal slashers,as metal slash is much more efficient.
Are you asking this because your going for nubis
I would guess he is. I had a bit of difficulty with that battle, yet I have 3 gryphons (I think eggs hate me lol. Er, well that depends how good you think gryphon is, because to me, er well he sucks)
And definetly use omega or arkwing. The elementless help, when you run out of metal slashers
I’m at the last arena battle and I just can’t get past all the metallic arks… I finally caught one, but if I fused it with blockadus would it still be element less? Or would it at least be a metal slasher??
I’m a girl FYI 
I’m a girl FYI
If you fused it with blockadus it would create barricadus which has really good defensive strength and certainly useful in some of those aspects but unfortunately it isn’t a metal slasher itself.