Pokémon Platinum / Gym 3 · Ghost-type Gym Leader

Fantina

Gym 3 · Ghost-type Gym Leader · Hearthome City

Fantina is both Hearthome’s Gym Leader and a Super Contest performer. She brings a love of performance to her Ghost-type battles.

Story: In Platinum she is the third Gym Leader and can be challenged on the first visit to Hearthome. This differs from Diamond and Pearl’s badge order.
In the game: First Gym battle in Platinum: Duskull Lv. 24; Haunter Lv. 24; Mismagius Lv. 26. Dark moves are useful. Normal and Fighting attacks cannot hit Ghost Pokémon without special effects; Mismagius also has coverage moves.
Gym puzzle: Use the flashlight to find the floor symbol, then choose the door bearing its matching symbol.
Rewards: Win the Relic Badge and TM65 Shadow Claw. The badge allows Defog outside battle once you have the HM. These are the first Gym teams, not the later Battleground rematches.

Story spoilers.

Pokémon Platinum · Nintendo DS · 2008 · Original Nintendo DS release; not Brilliant Diamond or Shining Pearl. · Picture: Original Nintendo DS-era Sinnoh Gym Leader sprite.