There's been a high volume of debate over the past few days especially in regard to IVs and EVS. For those of you who are unfamiliar with either, I will explain here. IVs stands for Individual Values. These are the natural, inherited stats of a Pokémon, sort of like genes. They range from 0 to 31, for each of the 6 stats: HP, Attack, Defense, Special, Special Defense, and Speed, and affect the stat by 1 point per at level 100. This means a Pokemon's stat can go up from a value of 250 with 0 IVs to 281 with 31 IVs, for example. IVs are determined when a Pokémon is generated by the game, and do not change during gameplay. They are also randomly inherited from parents breeding, though there are special items to make this less random. IVs have been in the games since Gen 1 (though slightly modified from Gen 1 and 2), and were even referenced in game by NPCs, who claim that "No two Pokémon are alike, even within the same species." For more on IVS, please read here: http://bulbapedia.bulbagarden.net/wiki/Individual_values EVs stands for Effort Values. These are the nurtured, trained stats of a Pokémon, sort of like exercise and practice. Effort values are what cause a trained Pokémon to have higher stats than an untrained counterpart of the same level. For every 4 EVs gained, a level 100 Pokémon will have 1 extra point in its stats. Variance of stats caused by EVs reaches a maximum of 63 points at level 100, as a Pokémon can gain a maximum of 252 EVs in a single stat as of Gen 6. The total EVs that a Pokémon can have is 510, or two maxed stats and one small improvement. EVs are gained mainly through battles. Each Pokémon has an EV yield, and will give some number of points to the Pokémon that beat it. For example, K.Oing a Pidgey will yield 1 speed EV. EVs can also be gained from supplements, such as Protein, which adds 10 EVs to attack, or Carbos, which adds 10 EVs to speed. In Gen 6, we are also given Super Training, which allows you to grind EVs in certain minigames. EVs have also been around since Gen 1, and though they were far larger numbers, they still affected stats the same. This is also referenced in game, by NPCs who noted that "Trained Pokémon are stronger than their wild counterparts, even at the same level." For more on EVs, please read here: http://bulbapedia.bulbagarden.net/wiki/Effort_values The concern that many people have is that IVs lead to breeding at catching for perfection. Take a look at any trading or Pokémon giveaway site and you will find tons of "breedjects," those Pokémon who were pretty good, but not perfect. And thus, may as well be released, as they won't suit the competitive scene. Even without breeding, this problem will still potentially exist, as players will catch and release until they randomly find their "perfect" or near perfect Pokémon. EVs seem to have less stigma against them, as it is easy to raise and lower them with effort and work. Typically only players who oppose grinding entirely will be against EVs. Tl;dr: Now to bring us to the question at hand. Do you want EVs and/or IVs in Pokémon Go?