Instructions
Go to the PokeStadium homepage. Hover your mouse over "Tools" on the navigation bar, which is below the image of a Lucario. A drop-down menu with only two options will appear. Click on "Make Trainer Card" on the drop-down menu.
Wait for the Trainer Card Maker page to load. All the information you enter will show up on your Trainer Card. Enter a name, which must be 15 characters or less, into the first box. Type your Friend Code into the second box. Select the link that is below the subtitle, "Trainer Sprite."
Pick a Trainer Sprite from the list on the new page that pops up. Take note of the number beside the Trainer Sprite. Return to the Trainer Card Maker page. Enter the number of the Trainer Sprite into the third box. Click on the drop-down menu beside "Badge Set."
Choose which region's badges you want to show up on your Trainer Card. For example, if you pick Kanto, you will have the eight Kanto badges on your Trainer Card. Type the names of six Pokemon into the boxes below "Choose Your Six Pokemon," which is the last subtitle.
Press "Make the Card." At the bottom of the screen, a Trainer Card will appear with the information you entered. Right-click the image and select "Copy Image Location." You can use this link to upload the Trainer Card to a website like Photobucket.