>>713840734 (OP)
first, how have you never played pokemon?
second, if you want to start modern, you're better off emulating black/white. you could start on bw 2 honestly, they're considered some of the best modern ones. of hg ss.
gameplaywise, pokemon is baby's first rpg. which isn't bad by itself (i'd put golden sun in the same level), it's just very obviously geared towards kids who aren't sweaty gamers. so it might get boring. the only complexity is making sure your 6 pokemon have good elemental coverage over strengths and weaknesses.
If I were you, completely blank slate, I'd start on heartgold. Or Crystal. Personally, I think Crystal is the most true to form pokemon game in terms of play and atmosphere