Jigglypuff
Jigglypuff is probably one of the most recognized Pokemon because she not only is from the first generation, but she also made frequent appearances in the anime and other media (including the Super Smash Bros. series). For what she lacks in the battling department, she certainly makes up for in terms of publicity. She is famous for her singing, which puts anyone who hears it to sleep. (To which she almost always responds to with an angry puff-up and proceeds to scribble on their face with her marker.)
I would say that what I find the most appealing about Jigglypuff is her nostalgia factor. As I had mentioned, I didn't have a Game Boy for the longest time, so I never got to play the first generation games until much later on. But I had access to the anime and to my 4th/5th grader self, I thought she and her antics were incredibly adorable and silly. She was also very easy to draw (well, maybe not as easy as Ditto...), so she became a frequent subjects for my doodles.
I would say that what I find the most appealing about Jigglypuff is her nostalgia factor. As I had mentioned, I didn't have a Game Boy for the longest time, so I never got to play the first generation games until much later on. But I had access to the anime and to my 4th/5th grader self, I thought she and her antics were incredibly adorable and silly. She was also very easy to draw (well, maybe not as easy as Ditto...), so she became a frequent subjects for my doodles.