POKEMONIUM!
http://pokemonium.net/
Download Link for client:
http://pokemonium.net/forum/showthread.php?tid=460
steps:
1. Sign Up
2. Click url in 2nd one (client link)
3. Follow directions
4. Play old pokemon ONLINE!Added (2012-04-20, 10:23 PM)
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To extract rar file after you download, you need winrar 
PLAYING POKEMON ONLINE!
Added (2012-04-20, 10:34 PM)
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For this game to work
U need to SIGN UP
and have a password consisting of
CAPITAL, LOWERCASE, and NUMBER
