In Digimon Story Cyber Sleuth Hacker´s Memory, there are textures from three Digimon that were not used in the final version of the game. The three Digimon are: Chimairamon, Bearmon and Skull Baluchimon.
The Chimairamon texture was used in Digimon Linkz and ReArise.
The Bearmon texture was used in ReArise (Interestingly, this texture that was used in ReArise has a slight difference from that shown in the post image).
So far, the only one that has not been used in any recent media is the Skull Baluchimon.