Ultracool dwarfs candidates based on six years of the Dark Energy Survey data

We present a sample of 19,583 ultracool dwarf candidates brighter than z $\leq 23$ selected from the Dark Energy Survey DR2 coadd data matched to VHS DR6, VIKING DR5 and AllWISE covering $\sim$ 4,800 $deg^2$. The were first pre-selected based on their (i-z), (z-Y), (Y-J) colours. They further classified using method that compares optical, near-infrared mid-infrared colours against templates M, L T dwarfs. 14,099 objects are presented as new remaining literature, including 5,342 our previous work. Using this deeper we also present: 20 candidate members nearby young moving groups (YMG) associations, variable sources four wide binary systems composed two Finally, show spectra twelve dwarfs discovered by group here for time. These spectroscopically confirmed sanity check selection photometric classification method.