To get to Elesa you must goto her old gym (the rollercoaster one) and talk to the girl where Elesa is supposed to be. Then carry on east until you see a building with a poke ball sign on the top (half pink half yellow) and that's the new gym. It is just up and left to the Audino statue. Hope this helps!
In Pokémon White 2, Elesa cannot be found in her Gym from Black and White but you must visit it in order for you to continue. Once you've spoken to the person that would have been Elesa's spot in Black and White then you can exit the building and head to the new Gym that Elesa set up which is all the way to the right of her old Gym.
In Driftveil City Gym
2 emolgas level 25 and a Zebstrika
You cannot find it in white 2
A trade is required from white or white 2 where it can be caught
in pokemon black and white
4 because the sell pokemon white and pokemon black and know they sell pokemon white 2 and pokemon black 2
2 emolgas level 25 and a Zebstrika
Talk to the trainer in her old gym to gain access to the new gym.
You can only find a Magma Stone in Pokemon Black 2, White 2, Pokemon Diamond, Pearl, and Platinum. It is not available in Pokemon Black and White.
You cannot find it in white 2
There is no best route in Pokemon White 2 to find shiny Pokemon, because you have the same chance to find a shiny Pokemon on every route in the game.
No
Tornadus cannot be found in Pokemon White 2.
Elesa has 2 Emolga and a Zebstrika. The Emolga are really annoying with their Volt Switch. They also know Aerial Ace and Pursuit. And maybe Double Team. Catch a Sandile on Route 4 and train it. Battle the trainers on Route 4, Desert Resort, Etc. This is all I can say. Good luck, future champions!
In Pokemon White you'd have to trade with someone who got it in Black/White 2
A trade is required from white or white 2 where it can be caught
in pokemon black and white
you can get kyurem