The Dream Magic Experiment

I was swimming or floating on the sea. I think I was on a Pokemon or a boat. I was able to get the HM Flash, so I can go down to the depths of caves in the sea.

I somehow "feel" into a whirlpool (or hole) and dropped underwater. It looked like a miner's cave with the wooden support, except that it's water all around me and no dirt. I was told that there is some sort of monster that eats people down there. I started to swim back up but find it hard. It seems the 'cave' was meant to lure people in. I had to summon Gyrados (although Garuda also came to mind) to defend me.

NOTE: Slept at around 4 a.m. I've been seeing a lot of dragons in my dreams lately. i think Gyrados still counts as dragon since it is dragon type???