The Crystal Gems win — but ONLY with teamwork and ONLY if Garnet realizes It’s true nature quickly.
Prime Pennywise is absurdly dangerous, but the Gems' immortality, fusion ability, and combat experience give them a real path to victory.

“Prime” Pennywise ≈ Pennywise at full power in his home dimension form (Deadlights) as shown across King canon + boosted by Welcome to Derry implications. Can create personalized hallucinations meant to break opponents psychologically.Reality warping Distorts environments, physics, and perception.Regeneration Physical form is basically a puppet; harming it isn't killing the true entity.Shapeshifting Becomes whatever scares or destabilizes the target.The Deadlights Can mentally stun living beings and trap consciousness.fear to become strongest. Targets who don’t fear him or who resist illusions diminish his power.Physical form can be beaten even if his true self persists.He can’t permanently kill non-biological, emotion-resistant beings