Why can't this Chansey participate in free battles?

Question

So Ive been using a Chansey on my team for a while now, and recently I went on Powersave to change its EVs, nature and IVs. So I know its not my hacking technique because I use this on every other Pokemon on my team and it works... Im going to post the full stats of her so that we know exactly where I went wrong...

Heres my Chansey, what makes it unusable in free battles?

Chansey @ Eviolite
Natural Cure
Sassy (I havent changed that yet)
Hatched at the battle resort 3/4/2015, somewhat vain.
lv100
-Heal Pulse
-Toxic
-Soft Boiled
-Heal Bell

HP: 704
Atk: 32
Def: 47
Sp. Atk: 108
Sp. Def: 302
Spd: 119

Whats wrong and how does free battle figure out that she is hacked?

Comments

You mean Regular battles?

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Battle-spot and regular battles yeah

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What's its exact EV yield? That may be the only problem.

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I think 252 HP 252 Sp. Def 4 Def

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Hmm.. Do you happen to know its IVs?

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Yup, 31 31 31 31 31 31

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I think you've given us either the wrong stats or the wrong IV and EV spread which may be something to do with why the Pokemon isn't usable. A Chansey with Sassy nature and full IVs with the EV spread you gave us has the following stats (that differ a fair bit from yours) HP:704, ATK:46, DEF:47, SATK:106, SDEF:339, Speed:122.

So most notably, your ATK stat and SDEF stat is far off what it should be and the speed and SATK stat is marginally smaller/larger than what it should be. The SATK must have some form of EV investment also which seems odd.  It may not explain your problem but it should help improve your set as some values are clearly lacking in some places.

Answer 1

Okay, using the Pokemon Showdown Simulator for Team-building I've discovered that there is no possible way that your EV/IV spread could yield those stats. HP is correct, as well as Defense but somehow the rest are messed up.

With perfect IVs going straight down and max EVs in HP and SP. Def, and four in Def, your Chansey's stats should look like this at Level 100.

I think you've given us either the wrong stats or the wrong IV and EV spread which may be something to do with why the Pokemon isn't usable. A Chansey with Sassy nature and full IVs with the EV spread you gave us has the following stats (that differ a fair bit from yours) HP:704, ATK:46, DEF:47, SATK:106, SDEF:339, Speed:122.

When you Powersaved it somehow it gained improper stats. This answer is based off what information you gave, as this is seemingly the only problem. Powersave another and see will you have the same problem.

Hopefully I've Helped