Hippowdon
from all noms hippo is the best, sr support + it checks a lot of stuff + recovery, tho that would problably end in a standard semi-stall esque + spikes + cm reuni as win con. i don't think gliscor is that good as an inmediate partner, i mean scor is very splashable, but adds 0 to help / support reuni, other than switch in. hazards and chip damage (rocky, barbs, rs, etc) are the best way to help cm reuni (spikes being really really good is why reuni had popped as a threat in oras), and from the noms seems like this gonna take a more bulky route, so hippo does the job of sr + sturdy wall. chomp would work too, but lack of recovery means you need to reinforce more on physical side.