Pokemon that you sometimes forget exist

All the dark Pokemon, is it a set or how many were there? What's the story behind them?

y'all remember heatmor? yeah me neither.

I forgot about Seaking until now when I checked the list online...

I keep forgetting Huntail is a thing.

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. :'(

The exact same goes for Solosis and Duosion, too!

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:

I forgot there was an alolan form of geodude.