Which Pokémon do you think are the most forgotten, like ones that aren't mentioned much anymore, due to poor design, poor stats, or something else.

I'd say Dunsparce.

I think everyone would agree with you on durnsparce I also say qwilfish

Nosepass, likely. Noone ever brings him up.

Girafarig doesn't come up nearly enough.

this may be wrong but I haven't heard of Tangela in a while

Dunsparce? No.

Snubbul? YES DEFINETELY.

Half of the time, I have little to no recollection of this thing...I don't even remember its Dex number.

I don't remember Its dex number but I remember it for being one of the few (or only) pokemon to come with clothes.

but what about goldeen?

Qwilfish perhaps? Maybe Chimecho?

huh what about Mareep?

Luvdisc. And a pretty darn good thing it was, too.

Clampearl and it's evos also farfetch'd corsola delibrid stantler mawvile volbeat and illomise.

need I say more?

Shuckle, magby, mr.mime, soon-to-be combee, the nidorans and smeargle are kind of forgotten alot as well.

Garchomp? JUST KIDDING!

I haven't heard of Taurous (isn't that how you spell it?) in a while. =/

What about Stantler or Pinsir?

Tyrogue.

Raticate. I barely ever hear Raticate used. Shame, really, 'cuz I had a Raticate on my Yellow version that kicked some butt.

Chimecho I blame it on the fact that it was quickly replaced in the anime with Mime Jr.

Banette.
While pokemon like duskclops got a 3rd evolution, banette got nothing and was outshined by all other ghost...well except sableye who was outshined by spiritomb. :V

BANETTE NEEDS A 3RD EVOLUTION! ;w;

Parasect.

To me, Paras/Parasect only have one use: TinyMushrooms/Big Mushrooms in FireRed/LeafGreen to pay the move tutor.

Oh yes dunsparce. Most useless pokemon. Also, Seel, Electrike, and Kricketot.

slugma is pretty forgotten

You know, I actually never once saw Surskit, or Gorebyss until my second run through of diamond. I was like "Wait what the hell are these" ...Yeah. So maybe that's just me.

Sunskern what about him?

I'd guess it's nincada

When was the last time you heard anyone say Azurill?

Today, I like azumarills.

Azumarill Insane Edition?

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I'm just going to list them off, going through a list of pokemon and seeing which ones aren't well known.
Sandshrew/Sandslash
Paras/Parasect
Venonat/Venomoth
Farfetch'd
Seel/Dewgong
Shellder/Cloyster
Pinsir
Hoppip-Jumpluff
Dunsparce
Qwilfish
Slugma/Magcargo
Stantler
Surskit/Masquerain
Mawile
Volbeat/Illumise
Spinda
Swablu/Altaria
Barboach/Wiscash
Kricketot/Kricketune
Cherubi/Cherrim

Metapod. It's manly, but no one mentions them anymore

Are you kidding? Metapod is very well know for it's uselessness. It's kakuna that isn't well known.