Its best if you use fighting type pokemon.
black- Sawk would be your best to use to beat the gym
white- Throh would be your best to use to beat the gym.
beat the thrd gym then go up noth
battle wild pokemon until yours is lvl18+
After you beat the 5th gym Bianca, she will give you the HM02 Fly
You have to beat all the gym leaders and get through victory road.
beat the 4 gym beat the 4 gym
you die
Have a water ice or grass pokemon.
beat the gym leader
After beating all the Gym Leaders, complete your pokedex.
You buy them when you beat your 4th gym
you have to beat gym leaders
a person at twist mountain will give it to you after you beat the gym fly gym i think...
beat the thrd gym then go up noth
After you beat the gym leaders in striaton city
battle wild pokemon until yours is lvl18+
beat pokemon gym leader clay,take on route 6, go through chargestone cave,then you'll be at the 6th gym.
beat the 8th gym