Got to Catch them All!
Important: This datapack requires Zairus Utility Datapack to be installed. Run this function at the spawn chunks:
/function zutility:rng_init
This data pack randomly adds pokemon heads to some mobs that can render heads.
Find several pokemon skinned player heads on Zombies, Skeletons, Husks, Drowned, etc., scattered around your world and make your collection.
The head drop rate is the same as standard equipment drop rate for mobs, so using looting enchant on your sword yields better result.
Enjoy hunting!