Re: Pokemon you never used but always wanted to.
Parasect, definitely. I used one in Pokemon Stadium and it knew Spore, Mega Drain, Slash, and Growth, so I was impressed from the get-go. Then I lucked into a fight with someone slower than Parasect. Thanks to RBY rules, every time they woke up, I put them back down again. Six Growths later, I could Mega Drain anything. So yeah, that was fun.
Also a lot of the strong rare Pokemon from the Safari Zone, Kangaskhan, Tauros, Chansey, Scyther, Pinsir. Anyone would have been a blast to try out in the original series.
"You see, in life, the road to darkness is a journey, not a light switch."
paired with the marvelous Eternal Moonlight, creator of the above