The Professor's assistant will stand outside the lab and ask you if its your birthday and will congratulate you.
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not much all that happens is cressilia becomes a running Pokemon
Nothing really, only the fact that you have it, and it exists.
Pokerus happens at random, it is about as rare a finding a shiny pokemon.
i think it happens when you beat the elite four
When the screen shakes it means that one of your Pokemon is poisoned and your HP is going down.