Why did Bellibolt's stats increase so much after EV training its SpA?

Question

Learning about EVs

Hi guys!

I'm kinda new to this part of the game, which people call Competitive Pokemon. I've played only the Ruby/Sapphire and I had no idea about those IVs and EVs or Breeding and those kind of stuff.

Now I'm trying to learn about this, and I am learning EVs "training" at the moment.

So, I saw that it is better to focus on 2 stats when growing EVs, and that means that I have a maximum of 510 EVs and it should be better to do 252 in 2 of them and 4 in another. THEN I was trying to train the EVs of my Bellibolt. But when I reached 251 (62 stat points), it went directly to 256 (63 stat points). Do you know what is going on? Am I doing something wrong?

PS.: I used Power Lens for reaching close to 252, and then took away the item and increased 1 by 1 until 252.

Comments

Does this count as a dupe?
https://pokemondb.net/pokebase/137236

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Yeah imo

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After reading the answers under that question, do you still have any questions about EVs?

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Yes, it helped a lot. But what I still don't get is why my sp. Att is getting 64 extra Stat points. Is it possible? Or am I making a mistake on the math?

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Can you explain this sentence more? "But when I reached 251 (62 stat points), it went directly to 256 (63 stat points)."
What did you see in-game when this happened, and what did you find strange about it? What level is Bellibolt?

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I miswrote it. So, I added 63 stat points to my initial sp. att. and it resulted 329. But when I reached 328, and trained once more for reaching 329, it went directly to 330 points.
Also, I didn't know it had a maximum EVs per stat. I was worried about training more than I need and the stats would be unbalanced. Now I know that it's impossible.
My Bellibolt is lvl 100.
(sorry about my english, if it's difficult to understand something)

Answer 1

This sounds to me like a bump stat. Likely an effect of the nature. Natures raise the actual stat by 10% (rounded down) which means if you were to have 99 in a stat you'd get 9 extra points on top of that from your nature. Then, after increasing the stat by one point to 100 you'll then get a 10th extra point meaning you got 2 stat points for the price of one.

300 + 10% = 330
299 + 10% (rounded down) = 328

I also just plugged your EV training into Pokemon showdown on a Bellibolt and that is exactly what happened. At least you're keeping track of your EVs correctly!