I think every pokémon should be like ursaluna
reason: it'd be funny
Minmaxing by itself isn’t dubious, so while I don’t agree entirely with your idea, I can tell that it can make for funny shenanigans.
Minmaxed stats was already a thing as far as in Gen 1, with the Shellder line, Jigglypuff + Wigglytuff, Diglett line, Gastly line, Abra line, Onix, Hitmonchan + Hitmonlee, Jynx, Eeveelutions, Chansey, Snorlax, and Mewtwo (Back then since Special is one stat instead of Special Attack and Special Defense, thus Mewtwo have effectively 154 Sp.A and 154 Sp.D)
That continued in Generation 2 with Shuckle, Sudowoodo, Wobbuffet, Sneasel (and Weavile from Gen 4), Donphan, Corsola, Hitmontop and Scizor which, while not as numerous, it will be a lie to say that minmaxing is non-existent.
For Gen 3, that will be Slaking, Aron line, Carvanha line, Wailmer line, Trapinch (and just Trapinch among it’s line), Absol, Ninjask, the three Regis, and especially all of Deoxys’ forms.
Same happening with Gen 4 and 5, but blatant minmaxing is still a rarity, but worringly common with Legendary and Mythical Pokémon, and the only Ultra Beast that didn’t minmaxed much is Celesteela, a titanic Ultra Beast who just happened to have balanced stats and not-that-low Speed.
Power creep mostly applies to the latter groups in particular, though a few standouts, with Dragapult and Toxapex for examples regarding Smogon tiers, but take note that those minmaxed Pokémon worked not just because of their minmaxed stats, but also because of their tools (high Speed, Clear Body and coverage for Dragapult, Knock Off and Regenerator for Toxapex), and there are some Pokémon that suffered BECAUSE of their minmaxing in addition of the tools not appropriate for such minmaxed stats, Stonjourner coming to mind.
It’s under agreement where true power creep happens is in Gen 8, and even then, it’s not because of “it just happens”, it’s a result of Game Freak’s horrible job at balancing, and as much as it’s impossible to make every Pokémon viable, there’s no excuse to just make a few new Pokémon too good for their own good.