I accidentally found the sprite sheet that was on "Photobucket" while cleaning out my inbox. You can see the sprite sheet here: [link]
Turns out the sprite sheet had been hosted on Imageshack, not Photobucket. Plus, I still lack the information on who ripped the sprites or even what game they came from. I thought they came from Sonic Advance 2, but apparently it is unclear which Sonic Advance game they came from, considering that the title of the sprite sheet got truncated.
These sprites, when animated, rotate. To make them rotate in the opposite direction, just switch the second and fourth columns from the lefthand side of the image.
Original sprites, the ones in the leftmost column, were ripped from Sonic Advance 2 by some unknown person. Whoever it was that ripped them did not put on the sheet their username or any form of identification (which is unfortunate). As a result, I cannot properly credit whoever ripped them. D: A copy of the original sheet of the original sprites (in the leftmost column) was found on Photobucket by BWARIO (aka KIDBUU4EVER on deviantArt). It is not known if the person who uploaded them to Photobucket was the one who ripped them or not. The sprites in the three columns on the right were scratch sprited by Midday-Mew of deviantArt (me!). GIVE CREDIT IF USED! THIS TOOK TWO DAYS!
Pokemon, Mew belong to Nintendo and Game Freak.
Original Chaos Emerald Sprites in the leftmost column belong to Sega and were ripped by whoever ripped them (I don't know who, that information has been unfortunately lost).
The sprites in the rightmost three columns belong to me! Do not claim as your own!
Chaos Emeralds, Sonic, Sonic Advance 2 belong to Sega.
Special thanks to ~KIDBUU4EVER
, for helping me find a sheet of the original sprites that are in the leftmost column.