Pokémon HeartGold and SoulSilver/Indigo Plateau
Go inside the building to find the Pokémon League. Heal your Pokémon at the Pokémon Center inside, and then restock your Full Restores and Revives. Save your game and talk to the man in red in front of the doorway at the top of the stairs. Go on through and begin the Elite Four.
Will
Will is the first Elite Four member you will face. He uses Psychic-type Pokémon.
Koga
Koga uses Poison-type Pokémon.
Bruno
Bruno uses Fighting-type Pokémon.
Karen
Karen uses Dark-type Pokémon.
Lance
Lance is the Champion of the Elite Four. He specializes in Dragon-type Pokémon.
After becoming Champion
Rival Silver
On certain days after becoming Champion, you will be challenged by your rival, Silver, at the steps outside the entrance to the Elite Four.
If the player's starter was Meganium
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Silver:  3840
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Sneasel and Magneton are both weak to Fire- and Fighting-types, such as Blaziken, or Machamp. Also, HeartGold players should have Ho-Oh, but beware if you choose to send it out against the Electric-type Magneton. Gengar and Alakazam can both be taken care of with a strong Dark-or Ghost-type, such as Haunter, who you may have from Ecruteak City's Burned Tower, for the Gym Battle there. For Alakazam, a Ghost-type would be recommended over a Dark-type, since the Ghost-type's immunity to Alakazam's Focus Blast essentially reduces it to a moveset of three attacks. Crobat's weaknesses are Electric-, Psychic-, Rock- and Ice-types. You should have a good Ice-type in your team from the Ice Path, and one would be strongly recommended, especially since it will prove super-effective in a later battle. SoulSilver players should also have Lugia, a Psychic-type. Typhlosion is Silver's strongest Pokémon, the final evolved form of the Pokémon he stole from Professor Elm at the beginning of the game. It is weakest to Water-types, such as Gyarados, which you may have from the Lake of Rage.
If the player's starter was Totodile
If the player's starter was Cyndaquil
Once Silver is defeated, he will pledge to further train his Pokémon, step aside, tell you to heal your Pokémon before challenging the Elite Four, and leave.
After collecting 16 Badges
If you return to Indigo Plateau after collecting the 16 Kanto Badges, the Elite Four's Pokémon will have significantly changed.
