>>15805920Person with the Unown as favorite here.
Ive seen this image posted on here a few times. Unown is pretty closely tied to its IV's already, Give it an evolution based on its stat with the highest IV. If multiple stats are tied for highest, it would then go based on its hidden power type as a tie breaker. Each evolution has a different 'role' to fill. Def/Sp Def are bulk, Atk/Sp Atk is a sweeper, HP is wall, Speed is used for setting up.
Give each evolution a different typing, the evolutions themselves are based on the Nazca Lines. This results in exactly 6 different possible evolutions for Unown fitting with its theme of it having multiple forms, and allows for a (theoretically) decent party of nothing but Unown evos, fitting in with their swarming theme.
Its flavorful, balanced, and not too much of a stretch for them.