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Please answer with an exact chance.

All answers that do not answer with an exact chance and a link that can back it up (or some other evidence) will be hidden.

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Horde Pokemon may have hidden abilities?
I don't think that being part of a horde means that that pokemon may have a hidden ability. I'm not sure, though, so if they do, I'd like to learn the answer to this question as well.
"In addition to this, there is the slight chance that one or more Pokémon in the Horde can have their Hidden Ability"
 - Quote from Serebii

I don't know how large this "slight chance" is, so I'm not answering, though.
I've seen people get Hidden Ability Pokemon from hoards, but it's just hard to determine it because some Hidden Abilities are impossible to tell, e.g. Regenerator Foongus. Something like Contrary Spinda is much easier to determine.
"All multi hit moves are calculated as if you're in the middle of a triple battle, but with two enemies at your side rather than allies. You can only capture Pokémon after you have defeated four of the five. In addition to this, there is the slight chance that one or more Pokémon in the Horde can have their Hidden Ability"

Source: http://www.serebii.net/xy/hordes.shtml
Sorry about the conversion but I don't think 'slight chance' really covers the question.
How can you tell it has a hidden ability anyway? XD
Use a move or something that shows its ability. Or they just have abilities that show themselves, like Intimidate or Mold Breaker.
I found a Minum with its hidden ability Volt absorb because it used entrainment xD
They don't always have their hidden ability.
I've seen Plusles and Minuses with 'Plus' and 'Minus' as their ability, so you're wrong there.
http://www.marriland.com/forums/pokemon-6th-generation/pokemon-x-y/455471-chance-of-getting-a-pokemon-with-ha-in-horde
http://www.serebii.net/xy/hordes.shtml
It seems like it varies.You are either very lucky or unlucky. I guess it's just one of those things that Nintendo/Game Freak is keeping from us.
Hope this helps.
I don't think this question is answerable. The exact chance a Pokemon will be found with it's HA is unknown. No site gives an exact chance. However we can assume that the chance will be much bigger in a horde due to there being 5 Pokemon as opposed to one (assuming the chance is the same in horde battles).
This is a hard question to answer. In fact, the only way to find it out is to extract the hidden data from the game, which won't be a while. So no need to fret :3
Just use for example the Ralts you get after beating the game, it has the ability trace which makes you see the others ability.
In a horde it copies a random ability.
This may not be a definite answer to this question because only Game Freak can answer this, but I estimate for a Pokémon in a horde battle to have a chance of having a HA is around 5%.

Source: I have been trying to get HAs for a while now, and I haven't seen to many of them. Also, it would be too much of a chance for a rare ability to have a 50% chance of a Pokémon to have it, wouldn't it?

I'm only guessing though, so I could be wrong.
While there is not exact percentage of the chance to find the Pokemon with the hidden ability(or it's just still unknown at the moment) it does say that there is a slight chance to find it.

It can be a long process to just catch random horde Pokemon if the ability is not something obvious so I would suggest using Pokemon that can learn Role play or something similar so you can check the ability mid-battle.
Here are all the Pokemon that can learn Role play since I mentioned it earler and just to save you trouble: http://pastebin.com/uPYqmuHZ
I highly doubt any "hidden data" will be revealed, the game has been out for over 3 months and we don't know the exact chance of it, i do not see any reason that Gamefreak would keep this hidden from anyone, at least not for this long, we all know you can get the hidden ability but no one knows how (un)likely it is. Horde battles have been announced way before the launch on October 12th, i don't recall if they revealed that you can get the hidden ability in horde battles but my guess would be that they have, therefore i really don't see why it would stay hidden for so long. They either won't tell us or don't know exactly themselves.
JackZero, they couldn't have just randomly put Hidden Ability in hordes. They would have HAD to put a chance of how to get it. Every game has a coding, like if you right now right click this page and click 'View Page Source' you can view the coding of the Pokemon DB. We easily accessed the coding of previous games, however no one has gone viral as to how to hack a 3DS. It's possible though - as mentioned in the many comments above, Smealum did it successfully. So we will have to wait for it.

And they didn't reveal it, yes, but same with the Friend Safari and the increased shiny chance - I suppose they are 'Easter Eggs'. :3
That's my point, and we don't know the chance of that either I believe, that's why i'm saying that if you're gonna wait for it to be released, well that day probably won't come :P
Yes it will. Hackers are like arsonists, they spray foundation (rumors) and then spread the fire (truth).
Ok, in that case let's wait for these hackers that have already been taking 3+ months for such a thing, i think they'd much rather hack for better stuff but alright I suppose if you wish to wait and see if it happens.
I can't find it. I've looked in this game's code for a total 6 hours or so over time.
You have the code? o3o

2 Answers

27 votes
 
Best answer

Now, I know you probably want an official source answer for this question, so feel free to hide this if you don’t think this is an acceptable answer.
However, I really doubt we will officially be told the exact chance, since we haven't already, and so I have decided to devise and experiment to answer this question.

The Experiment:

I looked around for Pokémon that appear in hordes that I could easily determine whether or not they had their hidden ability. In the end I settled on the Whismur hordes in Connecting Cave for this experiment.
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I chose Whismur for several reasons. Firstly, they are common, meaning I won’t be spending half an hour to get just one horde. Secondly, they have Soundproof as their only regular ability, and Rattled as their hidden ability. If you are thinking “how the heck do you easily test for Rattled?”, then my response is I didn’t need to. Since Soundproof is their only regular ability, those without Soundproof must therefore have Rattled. While Rattled may take some time to test for, Soundproof is very easy to test for. Simply have your Pokémon use Growl, and a message will flash up telling you how many have Soundproof. Since Growl affects every opponent, it means I only have to use it once to tell how many have Soundproof, and how many have Rattled.

My Growl user was my trusty Kricketune. Why? Well, that is mainly because Kricketune was the highest levelled Pokémon I had in my box that still knew Growl, which is generally considered rather useless.
enter image description here

I ended up testing 200 Whismur hordes, which gives a total of 1,000 individual Whismur.

The Results:

So now I have established my methods, what were my results? Well, 952 Whismur had the ability Soundproof and 48 had Rattled. Since I am only interested in the Hidden Ability for this, then 48/1000 = 0.048 or 4.8%

The Final Answer:

So from this experiment I got the chance of a Pokémon in a Horde with its Hidden Ability is 4.8%. Since GameFreak seems to like round numbers, I suggest the actual answer is probably 5% then.
If anyone else wants to try this experiment (either with Whismur, or another horde of your choice), then compare your results to mine and see what you get. Since this is statistics, the more people who actually do an experiment like this, then the more accurate our answer will actually be.

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And Kiraria also said 5%
And I found 10 Axew Hordes and 4 of them was HA then I took 5 Whismur hordes and 3 of them was HA
What number is your Trainer ID, and how many shinies did you encounter, if any? im doing another experiment about the correlation between the given Trainer ID number and the chances of getting s shiny pokemon, so this information would be very helpful.
Wow, this was a while ago. It was on my Pokemon Y game. My trainer ID was: 35734. I got no shinies :(
thank you so much!
How many shiny whismur did you encounter
4 votes

According to this statement:

It took me two hordes to find a Plusle with Lightning Rod, seven hordes to find a Zubat with Infiltrator, only two to get a Tailow with Scrappy, 5 to get a Whismur with Rattled (I corrected it from Scrappy) etc.

The chance to found a Pokemon with Hidden Abilities is 2+7+2+5/4 = 16/4 = 4, a HA Pokemon in 4 Hordes. Since 1 Horde consist of 5 Pokemons. It means 1 in 20 Pokemons. If this converted to a percentage, it's mean 100/20 = 5%. Just like MeloettaMelody said.

There is a way to check if a Pokemon had HA or not by this statement:

I usually lead with my Synchronizer and I switch into a Pokemon that is tough and tanky that has either Entrainment or Worry Seed as a move. That way I can check abilities one by one, and if none are the one I am looking for I run.

You should not catch them blindly, you really need ways to check abilities in battle with moves in order to increase your chances at catching the right one in the least amount of time.

Thanks for the advice, I went with Blastoise's suggestion and trained up an abra I caught in the friend safari to a level 42 kadabra with role play, so that I could see what ability each one in the horde had. Took me only 3 horde encounters until I found one which had hustle :D Gonna start breeding it today to try and get some more with HA, hopefully the fact that its male won't make it too hard.

Source

P.S: Sorry I can't confirm it since I still haven't own either Pokemon X/Y also I didn't owned 3DS.

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