Generation 1 is about 14 years old now, and I've been playing pokemon since it was first released on the game boy. Though despite that, there are still quite a number of Gen 1 pokemon I've never had any interest in using, both during or after the main game.
So are there any generation 1 pokemon you guys haven't really given a second thought about having on your team despite them being up for capture all these years? Is it because they're available too late in the games? That they're too weak? Or maybe you just don't like them?
To get the ball rolling, I've never used either Rhyhorn or it's evolution. Rhyhorn itself shows up at a point where I'll have all the pokemon I want, and although I do like the pokemon itself, I just can't be bothered to level it up to it's 50's for it to evolve. Why go through the work of getting Rhydon when I can have Nidoking or Nidoqueen, who look similar (not to mention cooler!) and whose base forms are available earlier?
Some of the Seafoam Island and fishing rod pokemon, like the Seel or Shellder evolution lines I've never been inclinded to use either, for similar reasons.