Well, if you want them for Essentials, you don't need them indexed. I posted the Platinum sprites in the Game Dev Resources thread a few months ago.
Also, to get them to fit the 128x128 space, then you have to resize them somewhat... The indexed sprites I posted in the ROM Hacking section were resized to be as close to their original size as possible, while still fitting in the space, while the Essentials sprites were all resized by the same amount. If you want, I'll resize the Essentials sprites the same way I did the indexed ones :)