It doesn't really do anything. All the guy does is talk to his dad and then he gives you a cell battery. If a Pokemon holds the cell battery, its attack will go up.
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A pokemon that knows Charge can, but you will need to get a pokemon from Pokemon White that knows Charge. Same goes for those who own Pokemon White, you will need to get a pokemon that knows Charge from Pokemon Black to activate the time machine.
get a pokemon that knows charge from the opposite game e.g if you have pokemon white get a pokemon that knows charge from pokemon black
nothing. he will keep on saying no.
In Pokemon Black, the Dowsing Machine is automatic. When an item is in range, it will point in that direction.
you need to send over from another pokemon game using the scientists machine after you defeat the pokemon league.