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Well, not everyone can remember every single Pokemon anymore. There's too damn many of them now.
So... *goes on Veekun for a complete list*
~Paras and Parasect
~Exeggcute and Exeggutor
~Horsea and Seadra (although I like Kingdra enough for it to ocassionally come to mind)
~Pinsir
~Sentret and Furret
~Hoppip, Skiploom, and Jumpluff
~Aipom and Ambipom :(
~Sunkern and Sunflora
~Pineco and Forretress
~Snubbull and Granbull
~Qwilfish
~Shuckle
~Swinub, Piloswine, and Mamoswine
~Remoraid and Octillery
~Delibird
~Stantler
~Shroomish and Breloom
~Whismur, Loudred, and Exploud
~Makuhita and Hariyama
~Volbeat and Illumise
~Spinda
~Barboach and Whiscash
~Chingling and Chimecho
~Kricketot and Kricketune
~Chatot
~Carnivine
~Finneon and Lumineon
...This list is depressing D:
DEFINETLY Gorebyss and Huntail. I don't think I ever evolved a Clamperl...
Hoppip's line.
I'm liek "Ok, i know Hoppip evolves into that green thing... but does THAT evolve into anything?"
It took me a while to remember Skiploom and Jumpluff.
Yes, the Hoppip line is my answer too. Particularly Skiploom, if you want to get technical. They're weak, (Hoppip starts with just splash o.o, and Jumpluff isn't really usable either), they're second-gen, and no one remembers the middle pokemon of three.
I couldn't even remember Skiploom's name before I noticed your post.