1.Shiny pokemon have their hidden abilities, or either equip a everstone to a pokemon with no assgined ability and it will have their hidden ability permanently.
2.You get the everstone from profesor Elm after showing him the togepi.
(Sorry for the english)
More bugs:
Sleep talk doesn't work ( don't know if it intended ,too broken for the hack or idk) Also there 2 sleep talker move tutors in the game.
Magnezone has gender, wrong sprite (minor) and typing reversed.
Helioptile line has no genders.
Magic guard doesn't work.
(Sorry for my english)