Where can I get the yache berry in ORAS?

Question

I need it for my emolga for the pikachu-cup

Answer 1

Yache Berry
Effect: Supereffective damage prevented from a Ice type move.
How to Get: There are three ways in which you can get this; firstly, from the Berry fields on Route 123, in the form of a reward from the Inverse Battle Stop or finally by reaching the Master Rank in contests so that a fan gives it to you.

There you have it, it can be found in route 123, from an Inverse Battle, or by winning a Master Rank Contest (random reward).

Source: http://segmentnext.com/2014/11/24/pokemon-omega-ruby-alpha-sapphire-berry-locations-guide-how-to-get/2/