Snorlax is barely OU these days
Heracross is UU.
GDose being UU back when UU was NU.
Scizor was a pretty boring pokemon until Plat came around.
As for Blissey, she's just fuckin crazy.
Also, do you realize what would need to happen to make this crappy little twerp usable?
1. Create a life orb like item that increases speed
2. Make a special version of sucker punch
3. Make Trick Room viable
4. Give him Vacuum Wave
5. General metagame changes.
You'd need to make U Turn and Pursuit unusable, and gen5 will have to introduce a plethora of fighting types to OU [and even then they can probably kick his ~50 base defense ass] or be ridiculously special attacks focused to make this thing usable.
None of that seems out of line, considering the fact that gens before Gen IV were special based, EVEN WITH Blissey soaking up shit like a sponge.
It could also end up being less speed based, as Gen 3 or 2 was.
Honestly, it's just a fact that to warrant such low base stats, over ALL gens, the Pokemon had to have more going for it, usually type-wise, [See: Skarmory in gen3] stats-allocation-wise [Jynx in gen 1] or having something unique going for it [Misdreavus in gen 2, Ninjask in gen 3] or a combination of all of these [Like Breloom in gen4]
We know so little about the pokemon that we can't judge anything but number 1.
That's... kind of what that means. I mean if Psychics weren't weak to those, they wouldn't really fear it. Plus Psychic is also very very mediocre offensively.
No that's not what it means. What you are saying is that its type is horrible no matter the metagame.
The bottom line is that the Pokemeta would have to turn upside down to make this thing viable.
Not at all. No major changes are really needed to get this thing to UU. Just give the damn thing Vacume Wave and suddenly a lot of its counters are no longer counters.
Honestly it's like wondering why Torkoal doesn't work.
Just because of the metagame. Under the right circumstances it could be a decent pokemon.