I haven't read on the tech issues. I figure the patch fixes will be quick. However, to OPs question, I'd second that starting with Brilliant Diamond/Shining Pearl is a great place. You'll know if it's for you or not.I find it hard to recommend this game with all the technical issues. Hope they get fixed in future patches. If you're new to Pokémon maybe start with one of the older games, like HeartGold on DS or Brilliant Diamond/Shining Pearl (a remake of older DS games).
I want to buy Pokémon but almost reached the limit of money that I can pay in a year to foreign banks. So I purchased a Nintendo eShop card from a local store to buy the digital version but I still need to wait until the bank payment is confirmed next week. That was really frustrating for me today.
By the way ValiantTraveler , you mention purchasing from the eShop. I'm liking the deals on DLCs in eShop. Do they sell individual cards to recharge balance? All I ever see out here in Mexico are cards for Nintendo Online.