And I can't really comment on the banners since I don't know much about making them (look pretty good to me, though for a few I can see Flora's point), but I do know a thing or two about spriting.
Looks like you have a good understanding of colors and outlining, but shading could use a bit of work. Like, the Bulbasaur revamps there... if I'm not msitaken, you just recolored them with the shading already used in the G/S sprites, right? That's not a bad start, but since the color palette's different in R/S/E and D/P/P style, you've got to try to match the way the shading's done for the best result. Here...
these were my attempts at the same task from quite a while ago. They're not the best examples, but they should at least give you an idea of what I'm getting at.
Same goes for the Fountain. The idea's pretty cool, but it needs a bit of shading to make the water look more like... well, water. That effect can be tough, but if you model it after the overworld map water, I think you can make it look good.
Overall though, not bad. Look forward to seeing more from you.
"Irregardless" and "Over exaggerated" are NEVER CORRECT EVER because they are redundant
Regardless means "without regard", and adding "ir" on the front actually makes it a double negative; exaggerate means "to overstate" so you're literally saying "over overstate."
Example: I can not
exaggerate the importance of this fact enough,
regardless of how often people ignore it.
