If you are looking for the port over Zelda and Shiek, it is not available yet. However, two hackers named SonicBrawler and StarWaffle have informed me that they are currently working on the project. If you want Shadow Mario and Bowser Jr. textures for Mario and Bowser or Squirtle try the links below.
Bowser Jr. over Bowser - http://www.box.net/shared/ce8e0ij4ib
Bowser Jr. over Squirtle - http://www.box.net/shared/3e3en20slt
Shadow Mario over Mario - http://www.mediafire.com/?mmdty3qmkjoxywy
shadow Mario is really bowser jr
Shadow Mario is not entirely a regular Mario series character. He wasn't really his own character. Bowser Jr. is Shadow Mario.
bowser
Yes. bowser is once again, the main antagonist. there are also many other returning bosses, including( but not restricted to) bowser Jr. Shadow Mario (as a basic enemy) King Whomp (from super Mario 64) and many others.
To face the bowser on Super Mario, one needs to beat every shadow on the Mario chase. This sums up to about 100 shine sprites.
You would have to use the texture hack.
bowser, egg man, bowser jr, metal sonic its on the back of the sign after the other machine in that town
Mario wins, but if Bowser is 2% better, BOWSER WINS.
Mario and peach luigi and daisy wario and mona rosalina and waluigi yoshi and birdo toad and toadette shadow queen and shadow mario donkey kong and candy diddy kong and dixie kong bowser and clawdia
butwell Upnor
You must use a texture hack.
The first Mario game with Bowser was Super Mario Brothers.