So, this is a project that I've been working on for a bit, and sharing in the Discord server as I go along, but it was done with a view to sharing it here. In
Digimon World 3, there is an internal collectible card game. There is no evolution in the card game per se, but if you play three or more of the same Digimon at once, it results in a "combo" that (temporarily? I haven't actually played it) gives you another Digimon, and many of these combos are clearly references to well-known evolution lines. Others are not evolutions that exist elsewhere in the franchise, but very well could. My idea was to make all these card evolutions into visual evolution trees, and you can see the results at the link below.
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A few notes here. Getting a combo with a Child or Adult Digimon results in a Perfect Digimon (unless it's V-dramon, which combos to Imperialdramon). For simplicity's sake, I've combined all Digimon that share a combo form into the same branch of a tree. Example:
Agumon x3 = MetalGreymon
Greymon x3 = MetalGreymon
MetalGreymon x3 = WarGreymon
Full line: Agumon > Greymon > MetalGreymon > WarGreymon
Because of this setup, each tree ends in a single Ultimate (except in cases where a species gets multiple cards). The last image in the linked gallery shows all the Ultimates that are left out because of this; there weren't enough Digimon to evolve into them. Note also that there are a few oddities in the levels that Digimon are assigned:
BlackKingNumemon = Ultimate
BlackMegaloGrowmon = Ultimate
MarineDevimon = Adult
SuperStarmon = Ultimate
Finally, cards in the game are divided into six colors: White, Blue, Green, Red, Black, and Brown. The Digimon names in the images are color-coded, though I've changed some of the colors to make them easier to read/differentiate and to better match their counterpart colors in the Digimon Card Game. Specifically I changed White to Yellow, Black to Purple, and Brown to Gray. Digimon with two colors in their name are the ones that got two different cards representing them.
I've said enough for now, but I'd be interested to hear what comments everyone has to make on these "lost" evolutionary relationships!