How Do I Give A Good EV Spread In Competitive Pokemon

Normally, this is the process that goes through my mind when trying to come up with an EV spread:

If I want a sweeper: 252 speed, 252 in the correct attack stat, and 4 in one of the defenses.

If I want a bulky sweeper: 252 in the correct attack stat, 252 in HP, and 4 in one of the defenses.

If I want a defensive wall: 252 in HP, 252 in one of the defenses, and 4 in the other defense.

You get the idea. I basically just put 252 in two stats, leaving one for putting 4. However, as I'm reading Smogon analysis and watching a few videos, I found that people tend to put stats like 108 or some other random stat. I literally just opened up Smogon strategy pokedex, and just clicked on a random Pokemon that happened to be Alcremie, and it puts 228 in it's defense stat. I saw this kind of distribution a lot. I want to know two things: where do they get these numbers? And how can I train myself to get these numbers? I'm battling in gen 7.

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How do you distribute EVs in PokÃ©mon?

So how do you make EV spreads for these Pokemon? One way is to maximize one stat, then place 128 EVs in two others. Another would be to spread it evenly with 168 in two stats and 172 in the third. However, none of these ways are likely to produce any efficient or particularly effective spreads.

What is the max EV spread?

The highest amount of EVs you can have in one stat is technically 255, but since the game calculates EVs by multiples of four, having 252 is the same thing. This way you can put the extra EVs in another stat.

Which stats should you EV train?

Instead, you would EV train a Pok\xe9mon in the stats that it excels at, and for Chansey, the optimal EV training would be in HP and Sp. Defense. Another example would be EV training a Volcarona. Volcarona excels in Special Attack and Speed, so you would EV train it in those stats.

Advanced EV Spread Guide for Pokemon VGC by EakesTV

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Tim Douglas, RODNAE Productions, Gustavo Fring, Gustavo Fring