Miki was a trainer who trained her Skarmory well. To have it gain more experience, Miki chooses Fire-type Pokémon to battle with. She managed to defeat Brock's Vulpix, but did not succeed in defeating Cyndaquil, who used Flamethrower on it. Seeing she has a lot to learn, she went with Skarmory to fight Gym Leaders.
Skarmory is Miki's only known Pokémon, which she uses in her many battles against Fire-type Pokémon, exploiting a significant type weakness.