Dactar

Dactar is a purple pterodactyl and the fictional enemy of Reptar, second only to Robosnail. He appears in the episode "Runaway Reptar" and The Rugrats Movie. Dactar was mentioned in Cavebabies.

Trivia

 * Dactar is similar to Rodan, a kaiju who frequently appears alongside Godzilla. However, the key difference is that while Dactar is a bona fide nemesis of Reptar, Rodan has been Godzilla's ally, fighting alongside him more often than against him.
 * He also resembles Ridley, the main antagonist of the Metroid franchise.

Gallery
You can find Dactar gallery here.