• English / United States: Danny
• Japanese / Japan: ダン
• Japanese (Romanized) / Japan: Dan
• Japanese (TL) / Japan: Dan

Danny is the leader of the Navel Island Gym and hands out the Sea Ruby Badge to trainers who defeat him. To obtain a Sea Ruby badge Danny set out a number of tasks for the trainer to complete.

Firstly, the trainer must climb the mountain located on Navel Island without using their Pokémon. Anyone accompanying the trainer can use the ski-lift to reach the top.

Secondly, the trainer must freeze some water being emitted from a geyser and then use their Pokémon to fashion the block of ice into a bobsled.

Lastly, the trainer must compete in a race in their bobsled against Danny and reach the bottom of the mountain. In addition, three of the trainer's Pokémon will ride with the trainer in the bobsled.