Golden Pomegranate when given to a tamed animal will instantly increase the animal's affection to max hearts.
Golden Pomegranate can be acquired by 2 ways:
1) Reach the final room of the 
Caves (Glyptodon Den).
Use the Owl Totem's power to fly to the south-western side of the room where the entrance to a southern room hides the de-transform platform. De-transform from the Owl power at the entrance and walk inside to find To, who will gift you 1 free Golden Pomegranate per season.
2) Complete all Prophecies and transform the 
Jungle to its final version.
In front of the new Jungle Pyramid Tree, the Glyptodons will offer to exchange 
64,000 Contribution Points for each Golden Pomegranate.
Unlike regular pomegranates, the Golden Pomegranate cannot be processed in any way or contributed to the village.