In a tournament for a Chaos Emerald, Tails shows that he is stronger than he looks, but gets defeated by Rouge the Bat.

Also, Rouge the Bat is usually depicted wearing pink clothing.

Rouge the Bat (Shifter)

Knuckles then sets off to find the pieces and restore the Master Emerald before Rouge the Bat.

Sonic the Hedgehog games, Sonic X (Rouge the Bat)

Meanwhile, Knuckles confronts both Rouge the Bat and Eggman, who each attempt to steal the Master Emerald.

Sonic Adventure 2 introduced two new characters to the Sonic series: Shadow the Hedgehog and Rouge the Bat.

Rouge the Bat: Rouge is a treasure-hunter and thief, and works for the government as a spy.

Topaz is a GUN agent and the human partner of Rouge the Bat.