1. Go AutoFight Menu and select "ID AutoBattler". Then type in 6505 (Twilight's Sparkle) and hit ENTER!
2. Wait a long time and let it bot!
3. Estimate when you have auto fought this enough times. Remember it "fake" steals around 4M of gold from your pocket. So it takes ~251 autofights to get this to negative value. One way to check if it has fake stolen 4 million gold is check how much negative XP you have. That means you need 2.98B of XP lost.
However, AQ database has a cap that uses INT32 value, which means that values cannot surpass +/- 2.147 billion. However, I noticed something nice about this. Even if you get -2.147B XP, you can still get to the chance to get 1B. It takes around 180 battles to reach the cap. That means you get a virtual ~-714M gold. When you see this stop:
4. Repeat step 1 but change the number to 9099 (Armegoggon level 160).
5. When you have close to 700M gold, please stop fighting and go repeat step 3 for another ~75 battles.
6. Repeat step 4 until you see 1B gold!
7. Enjoy your Gold!
Note: If you cap the Gold, you will not be able to get anymore gold.