Competitive gaming? Uh I guess the only thing that I've really poured time into learning about different mechanics, etc. is Pokémon. In X/Y, it was MUCH easier to breed and that made it a lot more enjoyable for me to breed specific Pokémon and get what I want. I mostly play doubles with a few of my friends, and for a short time I played battle spot doubles, though recently I've just not really had the urge to breed or EV train because it's just... boring to me nowadays, lol. Over the course of my very short competitive Pokemon "career", I've bred and raised about 40 different Pokémon for doubles/VGC (not that many, in truth). I still love the Miltank I bred back when X/Y was first out, it's too good.
Very recently I did force myself to breed an Aerodactyl and a Pinsir, maybe if I EV train them I can get back into it again.