Quoted By:
When I first played Pokemon Black/White I was so hyped for Ferrothorn, put some effort on training Ferroseed but once it evolved I was not disappointed. I think it's somehow hated for it's 50/50 design as in love it or hate it, competitively talking it's the same scenario.
The rest of contenders are
> Stunfisk
> Mr. Mime
> Regice
> Voltorb
> Magneton
> Grimer
> Skarmory
> Persian
> Spiritomb
> Minun
> Lunatone
> Solrock
> Lickitung
> Unown
> Nincada
> Carnivine
> Leafeon
> Musharna
> Garbodor
> Vullaby
> Aromatisse
And the rest of the Pokemon posted in this thread, all of them are disliked for a reason or another, I personally have lot of sympathy for them like almost for every other Pokemon.
