>>40308662It started off with the original Kanto pokémon so everyone, that's jaded fans and people who only watched the show and traded the cards in the 90s were instantly interested. The gameplay, if you could call it that, was extremely bare bones. See a monster, throw a ball, wash, rinse, repeat. Handholding/Easy as f gameplay is what goes mainstream. Not to mention all the little shitters getting all their info before it was released via their fave SpewTuber. I, for one, and many many others knew the game would be massive before it was even released. I mean you could just tell. I wish it never existed though as it was the final nail in the coffin for the Main Series games. Sigh...but it's never going away so why bother complaining eh? No disrespect to you or anyone else who likes the app.
There's a quick, vague, summary of why it did so well.