LogFAQs > #962437204

Gen 1. Has the best rival, has Missingno., and is generally way lower on dumb stuff like friendship or held item evolution. And if I wanted the QoL upgrades and additional content enough to sacrifice Missingno., there's a remake available.
Maybe if I'd actually played the remakes, Emerald/Platinum, or gotten to what seems to be a fan favorite with Gen 5 I'd feel differently but I was already tried of this franchise's single-player by Diamond so yeah.