I am gonna sound like a nerd but here’s my review:
Skeledirge: Too many fire moves, kinda need something like Shadow ball or grass Tera Blast
Ursaluna: Pretty good apart from Slash because it’s a special attacker, I would change it to Hyper Voice
Ogerpon: Not bad, but I think Low Kick should be changed to something like Stomping Tantrum
Terapagos: Replace Zen Headbutt with a setup move like Calm Mind, and maybe change Water Pulse to a more powerful coverage move like Ice Beam
Hydrapple: It’s a special attacker so replace Power Whip with something like Earth Power. Also, what’s the Tera type?
Pecharunt: You don’t really need Toxic because Malignant Chain will pretty much do the same thing so I would replace it with Recover, and Hex will be more powerful than Shadow Ball if the target is poisoned, which it will be most of the time