PKMN.NET :: Tips on Team Building :: Competitive Battling Team Rating and Building
Competitive Battling Team Rating and Building: Tips on Team Building |

100x100: 10,000
101x99: 9,999
102x98: 9996

This is why on a Pokémon with massive HP but low defenses like Blissey you'll more often see 252 def, as this makes a massive difference on defensive bulk, and on Pokémon with high defenses and low HP like dusknoir, you'll often see 252 HP, as that's best for both defenses and is more effective than 252 def/252 sdef.