Alright, thanks for the heads-up. I hadn't gotten my hands on a Joltik yet, so thanks for that and for replacing my Prism Scale like I asked.
Regular Ditto never passes on hidden abilities. I've tried it hundreds of times and it never worked. Aside from that, I also have the X/Y guidebook and it says that too. However, Imposter Ditto has the same odds as the opposite gender Pokémon you're breeding with, so long as that Pokémon has the hidden ability too (otherwise, it won't work). IIRC, the odds for a male passing on the hidden ability to the same species female in X/Y is like 20%, while females keep the 60% chance they had in Black/White. I think Imposter Ditto had the same odds as a DW female of passing on the ability in Black/White too, so long as the male it was breeding with had the hidden ability. I didn't get an Imposter Ditto until a month ago, so I can't say that last part for sure.