Namaskaram swami,
During Krishna avatar, he used Panchajanya in Mahabharata war. Is there any stories of Perumal related to Panchajanya(counch) other than Krishna avatar?
Adiyen
Here is one more instance I can recollect:
When Lord VAsudevA appeared before Dhruva, He placed His counch on Dhruva’s head; that was the moment of transformation for Dhruva.
Lord Shankha removes ignorance and gives spiritual knowledge.
Hopefully others will share more.
adiyen.
Srimate Raamnujaye Namaha,
Swamy you can hear enpani audio 2056 where a good background of Panchanjanya is given of how it exists eternally with Lord Krishna.. the audio was in reference to this thread. https://www.kinchit.org/dharma-sandeha/thread/paanchajanya-name-reason/ but has some additional information you are looking for.
Adiyen
Thiruckachidaasanudasan.