>>58077035Even that only really applied to a select few species like Voltorb, Grimer and Koffing, direct products of urbanization (mass production of Poke Balls and pollution). Most of them were just somehow elusive to dedicated researchers for centuries up until they stopped being elusive.
And most of all in the realm of the baffling are the excuses GS made: That not a single researcher or person thought to see what goes bump in the night, which is how you had species like Houndour and Murkrow who'd probably been living in Kanto for god knows how long slipping under everyone's radars until some time after Red became champion (including Oak's, the man who was responsible for most discoveries in the then-modern era), or that no one actually thought to show their mons love, care and compassion prior to Red's crowning achievement, which meant Crobat, Espeon, Umbreon and Blissey were totally unknown factors, even though Oak himself outright tells Red and Blue that the power of friendship is one of the most important metrics to a successful journey, especially one that involves filling out the Pokedex.