okay i feel you should always choose a Pokemon who is steel type to defeat Clair.all u need 2 do is just take an eevee, evolve it into UMBREON not espeon.teach it iron tail .
and defeat the 3 dragonairs.now comes kingdra ,but remember it may be in lv.40 but nothin to worry just use normal type moves like take down or quick attack
note: train umbreon as much as can. its defense and sp.defense is the best and the attack and sp.atk is also decent.i would suggest to train umbreon till lv.50 at least
with using a rock or ground type Pokemon, the best Pokemon you can use to defeat a electric type is rhyperior ok!?
Clair comes back in the dragons den use whirlpool and then go in the dragons den when you surf make sure you go left and then down
Teach it ice beam and repeatedly use it. The Totodile has to be at least level 50. Or else you die.
Lorelei has Ice and Water type pokemon, the best way to defeat her pokemon is to use Electric type pokemon or pokemon that have Electric type moves. Bruno has Fighting type pokemon and two Rock/Ground types, the best way to defeat his pokemon is to use Psychic pokemon or pokemon that have Psychic type moves. Agatha has Ghost and Poison type pokemon, the best way to defeat her pokemon is to also use Psychic type pokemon or pokemon with Psychic type attacks.
the pokemon you could use to defeat her is electric types or rock and ice
During your first battle against Clair, you can use Ice attacks against her Dragonair and Dragon-type attacks against Kingdra. With Gyarados, you can use an attack such as Thunderbolt since Gyarados is 4 times weak to Electric attacks.
all you need is lvl 40+ pokemon dragon's good, but ice is best) and put the boulders in the holes. use the walkway they created in the lava, and go beat clair! what seems strange is that they have lava in a kid game (no offense to teenage pokemon players)
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
If you mean Clair, then you should probably use ice type pokemon.
USE A FIAH TYPE.
That's easy, use psychic or ground pokemon. But psychic are the best.
I would say Groudon or Kyorge or deoxys or Jirachi or mew or mewtwo or rayquaza