Many Pokemon, like people have stated, are ignored. I mean, when R/S came out for awhile and took up basically a year of my playtime, I forgot how good a Farfetch'd was and Tangela. Tangela's SP. DEF. just blows, but it has strong defenses and good SP. ATK.
Pinsir WAS good. Why the heck did they remove Slash from it's moveset? That move was ONLY available on R/B/Y and no where else.
Heh, Metapod and Kakuna do have potential. I liked the episode when Ash went for his Hive Badge. Bugsy's Metapod was awesome in that episode. That enlightened me to think, 'Why don't the cocoon stages of Pokemon (bugs) get more moves?' like either Iron Defense, Take Down (Metapod).
I sware when I preordered Emerald, the little booklet that came with the tin case had a screenshot of a Silcoon using Double Team... Well, it does. In the back of the booklet where it talks about using strategies.
EDIT: Are you guys that Feraligatr can learn Dragon Claw along with Charizard and Sceptile? They're the only reptilian starters.