"Pokemon that are from a different generation than the one you associate them with"

I can't be the only one this has happened to:when you are playing one generation of pokemon or looking up a route in a certain region, and you spot a pokemon you could have sworn debuted in a later generation.The first time it happened with me, it was Slugma. You could have put a gun to my head and I would have swore that Slugma was a gen 3 debut. But apparently not. Apparently Slugma is a gen 2 pokemon. How I didn't know this is astounding, as Gen 2 was the time I was singularly obsessed with Pokemon!Has it ever happened to you? If so which Pokemon was the culprit?Eta: Apologies to those who have only discovered that Slugma is Gen 2 from me making this! That line is definitely the prime offender. If it makes you all feel better, I am feeling really vindicated right now! via /r/pokemon https://ift.tt/3nDvlJb