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It is weird, I hate some Pokemon so they go on my hate list. I find some Pokemon so they go on my useless list. Finally I know there are some "forgotten" Pokemon so they go on a list and not really that forgotten.
There was only one Pokemon that I forgot existed and it was just a derp moment. During a Challenge of a fanmade Pokemon game (Pokemon Island) I caught Pikachu even though I have a personal rule where I always catch the lowest form possible and evolve them myself. I seriously forgot that Pichu existed until I actually threw the ball and have the Pikachu in my party. Even then like I said was only a derp moment as I remember right after.
I think most baby Pokemon are forgettable simply because of how useless they are and how you can skip out on obtaining them.