UPDATE: WE THE FANS HAVE FOUND, TESTED AND CONFIRMED THAT WE CAN RESET THE BATTLE CLASSES!!!

YOU CAN NOW RESET THE BATTLE CLASSES USING THE ZOOKINATOR FOUND METHOD:
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THINGS YOU NEED:
1. Nintendo 3DS system.
2. SkyLanders Spyro’s Adventure video game.
3. SkyLanders Spyro’s Adventure, Giants or Swap Force Portal of Power.
4. Crystal with a Battle Class selected and an Imaginator created on that crystal.
5. SkyLanders Imaginators video game.
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STEPS:
1. Start up SI game and make an Imaginator.
2. Start up 3DS SSA game.
3. Talk to Wendel, the Mabu in the center of the map, he will prompt you to play a SkyLander on the Portal.
4. Place Crystal with an Imaginator on the 3DS SSA Portal of Power and Aim the 3DS at the Portal of Power.
5. It should not recognize in game and show an Error “Uh Oh a toy on the Portal of Power has a problem, Reset this SkyLander?”
6. Press the Reset button.
7. Another error screen displays “SORRY A toy on the Portal of Power can’t be used with this game. Please contact Activision Customer Service for assistance. Need more help? Check out your Quickstar Guide!”
8. Place that Crystal on the Portal that SkyLanders Imaginators is running on.
9. Crystal is now reset to factory defaults.
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Found by zookinator on DS.
Thanks to Thomas L for trying this out.