You can do that by getting the national pokedex and you go to the house where you pass to go to Stark mountain.{you surf to the house}
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yes it will change the time in Pokemon in either Pokemon diamond and pearl.
Just change the date on the DS and it'll effect the same as Pokemon Diamond.
You can make Magnemite appear in Fuego Ironworks as a Swarm after you obtain the National Pokedex from seeing every Pokemon in the Sinnoh Pokedex. To know if Magnemite has appeared talk to your rival's sister in Sandgem Town. If Magnemite hasn't appeared try again the next day as Pokemon Swarms change every day.
You can't. If you are playing on an emulator, you must download the US rom, or if on the DS, buy the US rom
Change the date on your DS/DSi