Masiah

I've played Pokemon pretty much all my life, but I've noticed a vast amount of differences between this game and the base games in terms of leveling,story,ect. I was wondering should I worry about catching quality Pokemon(i.e nature, and iv's) right off the bat? Or should I not worry until I get through the story/endgame when I have money,and different farming spots. Also if anyone could give me some basic beginner tips that'd be great! :Smile: