It let's you edit the icons that pokemon have, for example if you've ever seen a hacked pokemon game with Sonic replacing Charmander as a starter pokemon more than likely the icon (the little bouncing picture in the pokedex) was still a pic of charmander, you can use this tool to change that.
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get advanced trainer and then use it but if your using vista you might get an error
Look on Whack a hack.com or Scizz.com (if it's working) for it. Otherwise, you'll just have to search for one.
PokEdit
Overworld editor is a Pokemon hacking tool. Overworlds are the people or Pokemon when you are walking around (example, your char.) So if you use overworld editor, you could make a new hero, ( your person you chose.)
You can make animated Pokemon icon sprites using a variety of software. Examples of such software include Photoshop and Flash.