Idea for a past paradox Reuniclus that we've been brainstorming lately! Quite happy with how this one turned out.

Primal Union
Paradox Pokémon
Psychic/Electric
Ability: Protosynthesis
"A scientific journal of dubious origin describes an organism that is the common ancestor of all multicellular life: people, plants, and Pokemon alike. Primal Union closely resembles the organism from the aforementioned journal, despite the apparent impossibility that one Pokemon was the common eukaryotic ancestor."
Unique move: Synthase
The Pokemon becomes a wellspring of energy. This energy boosts the speed stat of itself and its allies by one stage each turn for three turns.

Primal Union was inspired by both endosymbiosis and eukaryogenesis: it features mitochondria (which become chloroplasts in the shiny palette) being absorbed by a larger cell body. The wings and horns on the membrane are meant to invoke Norse gods, as a nod to the Asgard group of archaea; these archaea were very likely the ancestors to all eukaryotes.