Erimakitokageps

The Erimakitokageps (エリマキトカゲプス) is a creature developed by Dr. Indigo using the chemical SIQ for Shiki's plot to use monstrous creatures to attack East Blue to force the World Government to submit to him.

This giant creature is purple colored and has a dinosaur-like appearance. For his giantic size, he can easily break stone walls, and it seems to have very resistant horns.

It appears in One Piece Film: Strong World, when the creatures from the flying islands invade Merveille, he is seen running toward Shiki's castle, and breaking its walls down.

Trivia

 * Its name comes from Erimaki Tokage (エリマキトカゲ) the japanese name for frilled lizard, referring to its frill.