Ep 37. Digimon Adventure 02 37

While the DNA digivolved digimon hold off BlackWarGreymon, Davis gets the idea of moving the last Destiny Stone with the D3s. Instead of moving it, this summons Azulongmon, the digimon that appeared as earlier destiny stones were destroyed. BlackWarGreymon attacks Azulongmon but quickly is shoved off and leaves after learning what his purpose is. After explaining many such things as the true purpose of the control spires and armor digivolving, Azulongmon warns the group about their true enemy, the one controlling Arukenimon and Mummymon. Davis sees a control spire in the real world.