IDK gamers, I think the Zamazentas are going to be a bit much to handle in this tier. I know this is rich coming from the guy who thinks Giratina could be balanced, but hear me out. We are already struggling to deal with Kingambit & the two doggos are coming here with similarish bulk, attacking stats that are still pretty high (120 is nothing to scoff at), STAB CC which is stronger than Chien-Pao's Sword of Ruin Crunch, and a blistering fast 128 / 138 Speed stat which almost nothing in the tier outspeeds. Checking Gambit and Chien-Pao are positive traits of the two doggos, but aside from that, I think that they'll mostly add uneeded strain on the builder since they're stat spreads are too OP in OU. I imagine that they'll force a lot of teams to run Rocky Helmet + Spikes, which will be annoying for them to deal with and would very likely keep them in check decently well, but forcing structures to run that ain't ideal. If generation 8 moves aren't back, Pokemon like Toxapex will have a harder time checking these the doggos since it can't make progress via Scald (or Toxic / Sludge bomb in Zama-C's case). While the Doggo's have been nerfed, they are arguably less nerfed compared to other Pokemon because they didn't lose crucial moves like Toxic, Knock Off, etc.
We'll have to wait and see, but I am expecting these guys to be kinda OP.