>>28238654No, it really doesn't.
When I first started competitive battling back in XY, I used my in-game team which consisted of my water starter, the event blaziken, charizard, mewtwo y, snorlax and gengar. They all had useless natures except for my mewtwo who was calm. I still rekt'd kids shit and earned my first 100 wins using this team(well i switched out my charizard and snorlax for ferro and garchomp, who were wonder traded). I didn't give a single fuck. But then again, I didn't know about natures and IV's too well. The only thing I had was full offensive strats and learned about common movesets of my different pokemon from watching streams.
That was almost 3 years ago. I changed and breed all my shit to perfection.