Yeah, Tuskal is broken, I was thinking "monsters aside from it" XD
I don't know, I find Karakai very good in general, but against poison for sure Slagg and Kabu are easier to use thanks to their comebacks mechanic, I agree. But if you have someone that gives enough dmg, with Karakai, against anyone else Karakai really shines, tanking lots of stuff with its enormous Def.
Skimander I agree it's awesome! Tricky to use, but awesome. Love it with Chip to do Rumble dmg and stun around.