A moment of silence for these five Digimon: Pyontomon, Mademon, Ganvivormon, Aequcedramon and Rurimon.
They were created as part of of the Digimon Adventure 20th Memorial Story project, in where the prize was just, and I quote, "Creation of your original Digimon partner & presented as a doll". That's it. So while all five of these were drawn by Kenji Watanabe, they are pretty much just art commissions. The prize was just getting official art and a plushie of your Digimon OC and that's it, nothing about making said OC official official, if you know what I mean. So, it seems extremely unlikely we will ever see any of these in any official Digimon media.
And I think that's a shame, because I really like these designs! Yes, Rurimon is basically just an Agumon recolor, not gonna argue with that, but the other ones at least... Pyontomon's design in particular just screams "Partner of one of the main characters in a Digimon anime", that jackalope mon deserves more love!
(I saw a Reddit comment saying that Rurimon and Pyontomon would so be the partners of the "Tai and Matt" of their series, that it would be really cool to see a dragonman mage instead of the usual paladin/warrior, and that also both have horns so maybe they can digivolve into something that parallels each other. And I'm mad now because yes I can see that and NOW I NEED THAT, FUCK.)
As a sidenote, Mademon's and Ganvivormon's meta backstories are positively heartwrenching: Mademon was based on the creator's childhood dog. And Ganvivormon was designed like that because the creator's wife was battling cancer at the time, and he wanted to gift her something to make her feel better...