Zamazenta-Crowned @ Rocky Helmet
Ability: Fur Coat
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe
Careful Nature
- Thunderous Kick
- Haze
- Anchor Shot
- Shore Up
I was seeing that groudon is weak to grass, ice, and water, so I think at least Pokemon that have an Ice coverage or Ice STAB, which are kyurem black, kyurem white, calyrex ice, Regieleki (Glacial Lance), and Zacian Crowned (Glacial Lance).
And then we have grass-types such as Kartana, and Ferrothorn, and also Water-types such as Palkia, barraskewda, Swampert, and the occasional Tapu Fini.
Ice-types are normally refrigerate (In some cases calyrex ice is poison heal) and most of them are physical, so I think Zamazenta would be a great partner to Groudon, and laso all of the mons that I mentioned are slower than Zama, so It will be excelent, and also that's why I chosed rocky helmet for it, as It can have a chip damage with that, and in the case of kyurem black, It'll be worn down by Rocky Helmet and Life Orb, if it uses extreme speed or fake out.
Talking about the mons that normally use Ice coverage, like Regieleki and Zacian Crowned:
252 Atk Choice Band Transistor Regieleki Bolt Beak (170 BP) vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 159-187 (40.9 - 48.1%) -- guaranteed 3HKO
252 Atk Choice Band Regieleki Glacial Lance vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 27-32 (6.9 - 8.2%) -- possibly the worst move ever
+1 252 Atk Zacian-Crowned V-create vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 218-258 (56.1 - 66.4%) -- guaranteed 2HKO
In the case of Regieleki, even with Bolt Beak, Zamazenta would wall it, and in the case of Zamazenta-Crowned, it could use Shore-up, due to with the drop on speed of V-create, Zamazenta will be faster than Zacian.
Well, with the grass-types, in the case of Ferrothorn, Zamazenta would 2HKO, due to the drop of Defense, and on the another hand for kartana, It could use V- Create with tough claws, but:
252 Atk Choice Band Tough Claws Kartana V-create vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 298-352 (76.8 - 90.7%) -- guaranteed 2HKO
But Kartana can't outspeed Zamazenta, so Zamazenta can deal with Kartana in some ways, and in BH there's a lot of sets that we can find, for example that set with scarf:
252 Atk Tough Claws Kartana V-create vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 200-236 (51.5 - 60.8%) -- guaranteed 2HKO
And then with the drop of Speed, Zamazenta outspeeds it.
252 Atk Tough Claws Kartana Multi-Attack vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 134-158 (34.5 - 40.7%) -- guaranteed 3HKO
+2 252 Atk Tough Claws Kartana Multi-Attack vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 266-314 (68.5 - 80.9%) -- guaranteed 2HKO
In the first scenario Zamazenta will win, but in the second can't, but Kartana will be weakened to later be revenge killed by a priority user.
And later with Water-types we have Palkia that it needs
252+ SpA Choice Specs Palkia Water Spout (150 BP) vs. 252 HP / 252+ SpD Zamazenta-Crowned in Rain: 372-438 (95.8 - 112.8%) -- 75% chance to OHKO
But normally, palkia isn't specs with swift swim, It could use lustrous orb, and also Palkia doesn't have Modest in some cases because it needs fishious rend because of that move doesn't rely on HP.
252 SpA Lustrous Orb Palkia Water Spout (150 BP) vs. 252 HP / 252+ SpD Zamazenta-Crowned in Rain: 271-321 (69.8 - 82.7%) -- guaranteed 2HKO
252 Atk Lustrous Orb Palkia Fishious Rend (170 BP) vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned in Rain: 130-154 (33.5 - 39.6%) -- guaranteed 3HKO
And also, the set of poison heal + glare would appear, and in this case Palkia is not in rain.
252 Atk Palkia Fishious Rend (170 BP) vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 73-87 (18.8 - 22.4%) -- possible 5HKO
And with Barraskewda:
252 Atk Choice Band Adaptability Barraskewda Fishious Rend (170 BP) vs. 252 HP / 252 Def Fur Coat Zamazenta-Crowned: 162-192 (41.7 - 49.4%) -- guaranteed 3HKO
Zamazenta Crowned still wall it.
And to later ends, Zamazenta Crowned can use anchor shot to an imposter such as Chansey, and passive walls, so It's a good mon to fit on Groudon.
For the last water-types, just thunderous kick and try to kill their by dropping defense, and Anchor shot to trap them, but in the case of swampert use Thunderous kick since normally that mon would use flip turn