→ ring a bell
Return of the VS Seeker
Return of Auto-Run
A Dolphin Pokemon. More precisely, bottle-nosed Dolphin not something like Kyorge which as far as I'm concerned is an Orca not a dolphin. Gorebyss isn't a Dolphin either.
That's ... pretty much it and the last one isn't even a feature. I never put too many expectations into new generations because otherwise I will just end up more and more disappointed.