I presume you mean Sabrina. SInce her entire gym is psychic type, use dark pokemon. Dark is supereffective on Psychic. If you have no Dark, then use bug. Same reason.
You go to the radio tower and finish the quiz correctly and then the gym leader goes to the gym.
Defeat the gym leader.
yes trade with a friend
press the red buton to raise the waterfall
kill all the trainers then try again.
You need to beat all gym leader's first, team rocket is there
You need to beat the gym in goldenrod then go to the flower shop right next to it.
in his gym
seafoam islands; 15th gym
In the gym!
no
Poke dolls can be bought at a poke mart after getting past the 4th gym leader.