Data If your Sprites aren't working

If you're using veekun as your image source for sprites, it appears they've done a database overhaul and changed the image URLs. Just go to the Pokemon's Page and "Copy Image Location" on the sprite you want, and paste it over the old data. That should fix any problems with missing sprites.

You can also use the short guide here if you have many sprites in your post. If you're running a browser that has WYSIWYG editing as a default, you can click "User CP," then "Edit Options," scroll down, select the option that says "Standard Editor - extra formatting controls," then Save. You should then be able to find and replace like the guide says.