I'm not sure if Shoddy will work on Java 5 (the most recent version still working on Windows 9x) but if it does the procedure will be this:
1. Download Java from
here (the download page is
here incase they've blocked direct linking to files)
2. Run the setup program and keep clicking Next.
3. Reboot.
4. Go to Start > Run and type
Code:
javaws http://shoddybattle.com/client/shoddybattle.php
5. Connect to the Smogon Server
6. Battle etc.