The first one looks good, but the bodies on the other two look kind of weird...like they're too big...and I'll think about the astronaut.
As for your suggestion, Shadow,...
On your journey, you will come upon a large beach-like town. However, if you walk towards the water, you'll notice what looks like a giant tube-like structure extending out and down into the ocean. Following that path, known as Underwater Route 1, you come upon an entire underwater city, home of the Blue Metro Station. Heading southwards, leaving the city through Underwater Route 2, eventually come to what looks like an eastward detour. Taking that way will bring you to an underwater building, the entrance to the *something*.
It'll be like a long, winding, underwater tube (But I can't call it battle tube, since it's already taken,) where you'll face many different trainers. At the end is where you get your prize, and there's also a jet tube (it looks really cool) that will take you back to the entrance.
As for your suggestion, Shadow,...
On your journey, you will come upon a large beach-like town. However, if you walk towards the water, you'll notice what looks like a giant tube-like structure extending out and down into the ocean. Following that path, known as Underwater Route 1, you come upon an entire underwater city, home of the Blue Metro Station. Heading southwards, leaving the city through Underwater Route 2, eventually come to what looks like an eastward detour. Taking that way will bring you to an underwater building, the entrance to the *something*.
It'll be like a long, winding, underwater tube (But I can't call it battle tube, since it's already taken,) where you'll face many different trainers. At the end is where you get your prize, and there's also a jet tube (it looks really cool) that will take you back to the entrance.