Explaining modern Pokémon games

[Symphony]

And if IVs/EVs/Natures discourage you to play the game, don't bother.

Natures 'only' offer a 10% increase or decrease in two stats.

It's impossible to complete your first playthrough with perfect EVs since you have to battle a lot of stuff. And even if you manage to get 252 EVs in the stat you'd like, the 50ish stat boost won't make a difference in the normal gameplay.

IVs are just plain random. And just like EVs, the points you're going to lose are not going to matter. (as 1 IV = 1 stat point at lv100)

It means that, if you're not looking to play competitively, the games remain pretty much the same way they did before. And even if you want to battle someone, there are countless ways of manipulating your pokemons, outside of straight-out battle simulators.