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I always get thrown off by Flabébé and Floette because they look so similar to me, not to mention I keep thinking Florges has only one pre-evolved form. :'(
I always seem to forget Silcoon and Cascoon exist for some reason... Also, when Spoing or Grumpig appear in battle it's always a surprise for me. I think they are very forgettable.
I remember forgetting about Stantler at one point, but that was years ago. Funny since it was the first Pokémon I used my Master Ball on (if memory serves). I actually kind of like Stantler. Its Neo card is kind of nostalgic.
The most recent Pokémon I found myself fumbling to remember was this guy: