PokEdit is an online Pokemon Editor. It's similar to PokeSav and PokeGEN, except it's web based. That means you can use it in any browser and any Operating System.
PokEdit's site has some pretty good tutorials on how to use the Editor.
http://www.pokedit.com/support/editor-how-to-use-the-pokemon-editor.php
PokEdit
Pokedit is a fan-made tool that allows players to modify or edit their Pokemon game save files. Users can change various aspects of their game, such as the Pokemon in their team, items in their inventory, or even the stats of their Pokemon. It typically involves downloading a save file, making edits using dedicated software, and then importing the modified save back into the game.