mine was gameboy because we didnt have much money, though we did (and still do) have some gameboys from when my parents were kids, so that was fun. sadly, my copy of pokemon red broke a while ago because its 30 years old or smth.
My first experience with Pokemon is my dad's old copy of Pokemon Silver. I played it to death. It's battery died when I was in the middle of catching an Ariados. I will never forget that pain.
mine was pokemon the movie: i choose you, where i cried and got REALLY into the series. here i am now, having almost completely beaten legends: arceus in like 4 days