Just put down your favorite lesser-known Pokémon is, why, and, if you know, how many episodes it was in.
Also, just as a guideline, a lesser-known is determined by how many episodes it was in. All Pokémon MUST be shown in less than 50 episodes, not including specials.
My favorite is Furret.
A few I know off the top of my head are Sableye, Burmy, Mawile(sp?), Hoppip, Smeargle, Quilfish(sp?), Weepinbell(sp?). This all I remember for now; a good example of how lesser-known these pokémon are, we can't recall them right away cause we haven't really seen them!
my fave is DUNSPARCE because its awesome and would kick giratinas ass anyday.
Porygon2. It is the least famous Porygon evo, and has never been on an episode.
A lot of some of the cuter Pokemon (espesally Johtos) seem to be kinda lesser-known, as why I joined.
I like the Hoppip line :D ^_^
Masquerain, Castform and my all time favourite Kakuna
My favorite is Butterfree.
But Butterfree was owned by a main character... THE main character actually.
(Caterpie and Butterfree both have foods in their names, but Metapod doesn't...)
Also, I agree with Region Master about Qwilfish. I went almost 2 years thinking that I knew all of the Pokemon until I saw a Qwilfish...
PorygonZ, its powerful in games, but is in 0 anime episodes.
I LOVE LOVE LOVE porygon and ALL of its evolutions. Parasect is also pretty cool too.