I think Koko itself is broken with Tera. Its just a little worse Regieleki with Tera Ice, being able to be physical or special. Moth I think is fine with or without Koko, it never felt to me a problematic Mon during the whole Gen.
There are some problems:
-koko has lower spattk, and terrain boost is ×1,3, so mons like slowking galar, heatran, ting-lu, blissey can take koko hits with tera ice.
-Koko has a clearly lower speed so it can be revenge killed by scarf, booster energy mons, and specs dragapult.
-Koko's power depends on electric surge, if we remove it from the field, it becomes less powerful
-Tera ice would force it to run boots instead of specs, because of hasards, but with boots, the damages wouldn't be enough to Ko everything.
-Regieleki is so fast it can run modest, whereas modest koko would be easy to revenge kill.
-The best physical electric move learnt by koko is wild charge, which has recoil and is a contact move. Physical set would be just checked by zam, garganacl, and maybe even tusk because this thing is too bulky. Also, there is no physical fairy move on koko. Choice band sets would die very quickly because of recoil and hasards.
However, koko also has cm, ice/electrik is almost impossible to resist, and it could run physical and special sets which would have different counterplays, so yeah it could be broken, but clearly not as much as regieleki.
With rising voltage, it would be banned quickly, but without it, it could stay ou after the "first wave of bans", and koko could be banned a few weeks after.
However, we don't know which mons are back, and with which moves, we don't now all the new mons and their typing, so it's hard to tell.
I think unbanned mons, iv, and new or returning crazy mons will be better than it, because there is always at least one crazy mon banned just after the beginning of a new meta, because gamefreak always finds a way to create a new absurdly strong thing (Like flutter mane and many others at the beginning of the gen, returning mag and regieleki after home, scale shot bax and ogerpon fire after dlc1), but maybe I'm too pessimistic.
Anyway, like I said in every post, we'll see
Edit: 115 attk isn't so strong, I thought koko had 120 but its 115.
Also, the electric surge lasts only 5 turns and can be removed.
I think koko should at least allowed at the beginning, it's way less powerful than regieleki. Also, we don't know if ferrothorn is back
I also think koko would be broken, but we can't be 100% sure unless if the council lets koko be ou at the beginning of the dlc2 meta.
We also aren't even sure that koko is back lol. We put the chart before the mudsdale (I might have done a grammar mistake but that's allriiiiiight)
