Nothing, to evolve haunter you have to trade him...
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insert the sapphire cartlige in your ds then the diamond and turn it on. Go into Pokemon diamond and an option should be migrate from sapphire. If this does not happen, there is a possibility that your game is fake. Look further into this via Google.
In the first movie Ash was turned to stone...In a Pokémon indigo episode Ash died from three ghost Pokémon (Ghastly, Haunter and Gengar) he became a ghost but somehow came back to life (Pikachu also had the same happen to him)
You know, Pokerus can happen in any version. But anyway pokerus is a virus you can get very rarely from a wild Pokemon.( unfortunatly, you cant tell if the wild Pokemon has the pokerus.) Also you can heal your Pokemon alot of times. Its never happened to my Pokemon before but if you want more info. about it you can buy a Pokemon pearl/diamond guide. that's where I got the info.
Pokemon events happen at random points in a year usually to coincide with a special release.
nothing