Bloodmoon Ursaluna - Ground/Normal, 113/70/120/135/65/52 (Total: 555)
Will likely be inconsequential. No one stat is a standout, and aside from having STAB Boomburst / Ground Revdance, there's basically no reason to use it. 135 SpA is also kinda just... low, as Ursaluna's relevance was only really propped up by Population Bomb's insane damage potential (plus its Attack is higher than BM's SpA). As a PhysDef, being weak to Fighting is a severe issue.
Okidogi - Poison/Fighting, 88/128/115/58/86/80 (Total: 555)
Don't think this will ever see use. Typing is potentially decent as a CC spammer that bombs Fairies with STAB, but anything with a 120 STAB + Gigaton will likely outdo it thanks to its mediocre base stats.
Munkidori - Poison/Psychic, 88/75/66/130/90/106 (Total: 555)
This has an OK (I guess? Psychic does it zero favours) typing but is almost directly outclassed at everything. Defensively it is a severe step down from Arceus-Poison and the other Fairy resists, and offensively Eternatus exists.
Fezandipiti - Poison/Fairy, 88/91/82/70/129/99 (Total: 550)
Typing is really cool but those offensive stats are
really poor. Its also geared to be a special tank but is still frailer and faster than POgre and much frailer than Arceus.
Ogrepon (Teal Mask) - Grass, 80/120/84/60/96/110 (Total: 550) (All 4 of these have the same BST and spread)
Geared as a Grass Physical Attacker, which are both kinda meh and also Kartana exists (and outrunning Kart / Speedtieing MDia isn't making up for no Steel STAB and 61 base Attack). Defensively Grass is pretty poor and this has all-around bad stats for the job anyway.
Ogerpon (Wellspring Mask) - Grass/Water
Grass that isn't weak to V-create, or Water that isn't weak to Leaf Storm? I guess? Cool typing but stat spread basically removes the defensive niche otherwise granted.
Ogerpon (Heartflame Mask) - Grass/Fire
Its the same as the one above - typing's geared defensively but the BST drags it back. Offensively, this has a little more hope in that it has STAB V-create + Solar Beam, meaning it can maybe slightly beat MBlaze?
Ogerpon (Cornerstone Mask) - Grass/Rock
what even is this