the pokemon you could use to defeat her is electric types or rock and ice
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use ice and dragon type
with using a rock or ground type Pokemon, the best Pokemon you can use to defeat a electric type is rhyperior ok!?
You can't get it in Pokemon Black. Use PokeTransfer or Dream World.
Ice type Pokemon can easily defeat lance's Pokemon also for his gyrados and aerodactyl you can use an electric type.
use all your Pokemon every time you win 1 Pokemon switch for a difrent Pokemon or use groudons best move earthquake or fire killer blasst