This is the rules page... please be courteous and follow them. They are basically all common sense stuff.
1 - No crude/rude/inappropiate use of words or pictures. Keep everything PG.
2 - These are the pokemon in which you are not allowed to start out with. I'm not entirely sure about the diamond and pearl pokemon, so if you feel one of these should be removed or added to this list, please let me know:
Articuno, Zapados, Moltres
Raikou, Entei, Suicune
Lugia, Ho-oh, Celebi
Regice, Registeel, Regirock, Regigigas
Kyogre, Groudon, Rayquaza
Uxie, Mesprit, Azelf
Heatran, Rotom, Shaymin, Phione, Manaphy
Giratina, Cresselia, Darkrai, Arceus
3 - Have fun!