The White Lopmon is a legendary Lopmon said to imbue immense holy energy. Neo Vamdemon was terrified at the thought of one existing.
In order to give Shoutmon and MetalGreymon the ability to fight off the Death General, Lopmon absorbed the power of all of the other Lopmon that had been devoured by Neo Vamdemon and became the White Lopmon. With the last of his energy, he gave Omega Shoutmon and Zeke Greymon the ability to Double Xros.
White Lopmon in Digimon Xros Wars.
White Lopmon along with the rest of deceased Lopmon in Digimon Xros Wars.