"PSA: When evolving for CP, don't only look at total IV"

#PokemonGO: So in today's gym meta CP is - more or less - the only thing that counts, if you're lucky enough to be around a mostly stable environment. People waiting for their friends or the bus battle for a bit and kick the lowest Pokemons out, and occasionally your own team members do the same to place their own Pokemons. For me, that's the environment I play in, and the only solution is highest CP.Now, the highest CP Pokemons you'll find in this meta are the same boring Dragonite, Snorlax, Rhydon, Gyarados and Vaporeon. Over here it's mostly Vaporeons, since Eevees are ubiquitous. And of course, I built my own army. I don't get too many great ones (I caught seven Eeeves with 90+ IV out of 569 so far, and only two became Vaporeons), so I started to take to 73% IV and better. A few months back I evolved a random level 30 Eevee I caught despite knowing it was worst tier, and kept it as it became a Vaporeon. I recently pushed a bunch of Vaporeons to level 35 and was surprised by the spread of CP that resulted.The numbers in detail:IV (%)ATKDEFSTACP93.3151512291575.691312282173.341415277840.013232743While it's obvious that the 40% one was a waste of stardust to begin with, this table had a few surprises to me.There is just one step difference between the second and the third Vaporeon, yet the CP difference is pretty large.There is twelve steps difference between the third and the fourth Vaporeon, yet the CP difference is smaller than between the second and the third.So obviously, there's more to IV then just the total. A Vaporeon at level 35 ranges between 2550 and 2931CP, so the effect of IV is a whopping 381CP. /u/CpMultiplier posted the actual formula half a year back here, and I saw it earlier, but I missed an implication. The impact of the Attack stat is as big as that of both Defense and Stamina together! And I chose 73.3/75.6% IV Pokemons with low attack stats to level up. What a waste of stardust.I created a graph showing the range of CP gain from IVs for my particular scenario (level 35 Vaporeon). You can find it here. It shows for example that a great 84.4% Vaporeon can reach 90% of the maximum CP, while a bad 93.3% one can stay below. It also shows the worst cases you can get with Attack at 15 and Attack at 13, which is something you can easily get from appraisal without the use of a detailed IV calculator.I'd like to take a moment to thank /u/testorom for creating his game master decoder - it made scripting the data analysis a bit easier for me. It also allows me to offer you additional such graphs for other species and/or levels, just no half steps please - I am too lazy to deal with aCPM.TL;DR: If you evolve for high CP, make sure you have a high attack stat to go with high IV. Don't waste your stardust like I did. via /r/TheSilphRoad http://ift.tt/2kEk2zY