How do i beat the 8th gym leader on pokemon soul silver?

Yeah Clair's a tough cookie to beat in that game, since she has Dragonair, and her dumb Kingdra I suggest starting with Gyrados using Dragon Rage (since it always does 40 damage), also the Beedril with Toxic Spikes will be very usefulm if lucky your Togekiss's Mentronome would help. If you used Beedril to use Poison spikes then sent out Pidgeot to keep healing itself with Roost, if any faint just sent out Krabby to faint then use another, you'll get it as long as you heal