There is no certain number, It's just a rare occurance.
The Pokerus is a helpful virus which helps your Pokemon to get stronger more quickly. :) Each time you defeat an enemy, you get special effort points which help determine which stats are most improved upon levelling up. With the Pokerus, these effort points are doubled, so you don't have to defeat as many enemies to get the stats you want improved. Once your Pokemon has recovered from Pokerus (it will have a little smiley face or dot beside its picture) it can never catch it again, but I've read that the benefits of Pokerus stay forever. You should put an infected Pokemon in your computer so you can infect your newcomers in the future. Pokemon don't recover from the Pokerus for as long as they are in the computer :)
i bet them and Cynthia 5 times in Pokemon platinum.
It is a disease that effects your pokemon in many good ways.
it depends how many Pokemon you defeat and/or catch
Yes... I'm sure they could, but I think that you can only contract PokeRus from wild Pokemon or from fellow, in-game Pokemon. Link battles seem to be an exception to many normal Pokemon rules (like stealing items), so you can't guarantee your Pokemon will catch PokeRus through a WiFi battle.
One to three without items and Pokerus, up to, I think, eight with Pokerus and the right items. Go to Bulbapedia if you want to know which Pokemon give you which EVs.
You see Cynthia many times in Pokemon platinum. She gives you an egg containing a togepi in eterna city. She also meets you on your way to meeting and catching giratina. Also, if you defeat the elite four, you battle her for the title of Pokemon champion.
Check for sure if your Luxray has PokeRus by checking its status screen. If it has a face (like an emoticon) near its picture and the word 'Pkrs' under 'status', then it has PokeRus. Of course, your Luxray may have just gotten lucky in gaining 5 attack points. Many Pokemon from time to time gain such an ammount of points here and there. It is only when they occur at every level that your Pokemon should have PokeRus. You will not lose PokeRus if you turn your DS off...unless you didn't save the game. The act of turning the DS off will not destroy the virus, but if you leave Luxray out in the party, it will lose the virus in 24 hours. If you wish to keep PokeRus, store the infected Pokemon in your PC. Only when you take it out and not put it back in the PC, does your Pokemon become immune to PokeRus. Also, keeping your Pokemon in the PC does not mean that it will infect every Pokemon in there. The PC is a form of containing the virus. Besides, PokeRus only spreads to Pokemon in the party because the infected Pokemon is taken out to battle.
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