For Lenora, the trick is: after you knock out the Herdier, switch to a pokemon you don't plan on using and use the turn to heal up your main pokemon. Chances are, retaliate will take out the pokemon you don't need. That gives you a free switch into your main pokemon for the fight.
Elesa is the hardest, because her Emolgas are flying type. There aren't a lot of types that can dish out damage while also taking volt switches. A Boldore is a decent option, but it won't be able to take too many volt switches. I find that Drilburs are very effective, as well as Yamasks and Sandiles.
