Pocket monster emerald introduction

First, go upstream, reach a cave above and talk to the Water Warfare Corps. I learned that the leader of the Water Warfare Corps was in Kayi, and flew to Kayi to find that curator Nanmu was being interviewed by TV. After the dialogue, they entered the dock, and the water war group snatched the submarine, flew back to Atian City, entered the cave and went deep. The submarine on the water war group ran away, and those Pippi whales disappeared.