Step 1. You need to be upgrading something in the laboratory (wallbreakers work the best)
2. Make shore your army camps are full of troops
3. Fill all your barracks with whatever you are upgrading
4. Finish what you are upgrading in the laboratory faster with gems
5. Take all the troops that were in your barracks out of your barracks
6. YOU WILL HAVE MORE ELIXIR OR DARK ELIXIR!