My first main series game was Yellow, which I got for Christmas in 1999. My cousin and aunt convinced me that I would like it, and needless to say, I got hooked on it almost immediately. OTOH, I remember doing all kinds of stupid and ignorant things and making silly mistakes on it (e.g. using electric attacks against Brock's Pokémon, trying to catch other trainers' Pokémon, running from battles with legendaries, and whatever else) in the first several months or so of playing it...