I dunno how many people are aware of this, but I don't really play the Pokemon gsmes competitively, I just play them casually. I don't try and hack my games, (i've tried on a Firered rom and nearly broke my mom's computer so that didn't work lol) but I've found ym far share of rare Pokemon, including some with hiddena blities. (which i only know because of the fact of Pokemondatabase.com, so thank god for them) So far I know of at least 2 of my pokemon have hidden abilities, an Eevee and a Poochyena. If anybody wants either of the two, lemme know! (This is for my Omega Ruby game, I won't do the same on my Moon or Ice's Y games) Here's the info on them both:

Poochyena, male, lv. 2
OT Jenny
HP 13
ATTACK 6
DEFENSE 7
SP. ATK 6
SP. DEF 6
SPEED 6 
Nature: Bold
Ability: Rattle (hidden ability) <Some move types scare the Pokemon and boost Speed stat>
Item: nothing (I may add an item as a surprise gift) 
Movies: 
Poison Fang
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Eevee (Nicknamed 'Hidden'), male, Lv. 8
OT Jenny
HP 28
ATTACK 15
DEFENSE 11
SP. ATK 13
SP. DEF 16
SPEED 14
Nature: Hasty
Ability: Anticipation (hidden ability) <The pokemon senses dangerous moves, like instant- kill moves or move that can faint the Pokemon> 
Item: None
Moves: 
Flail
Tackle
Tail Whip
Sand Attack

You may need to add m 2DS friend code, so here ya g!
Jenny
1349-7514-1808