>>723652548
Plotmon and Tailmon are holy species digimon as signified by their holy rings which other holy rookies have such as Kudamon and Tapirmon. Originally Holydramon was an alternative stage 5 evo for Tailmon that focused more on its beast side whereas Angewomon focuses more on the holy side.

Generally digimon evolve into digimon with similar typings or traits rather than something completely random, that's why media outside of the tv shows and manga for obvious reasons portray evolution as a tree instead of a linear line.