Use the HM Flash this is given by the sage at the top of sprout tower.
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Teach one of your pokemon 'flash' using a TM/HM
no its impossible to have light type but there is a dark though!
As far as I know you can only get it with Pokemon that already have it. But i expect you could find one in dark places like caves.
Raises if hit by a dark type move
how do you use flash? just go to pokemon and go to the pokemon that knows flash. press A and it will say in blue text "Flash" select that and it will use Flash. it's very useful in dark caves.