Here's a list of all the Pokemon found in that picture:
- Alolan Exxegutor
One of the riders helmet was inspired by Pyukumuku (Tauros rider).
The other helmet (Mudsdale rider) is a Pokemon we've yet to see.
There are tiny white birds flying near the boat/yacht. But I'd assume those are just Wingulls.
There is also a shooting star falling on the upper-left. I'm guessing it's Minior.
hmmm I was thinking it was Grubbin themed, but it doesn't quite match.