The Pokemon Situation Game

[Adam Levine]

Hi guys! Since I was bored,I decided to make even for trivia.
How to Play: At the situation above,look for a clever answer. Ex:

Originally Posted by Player 1: A Drowzee can't go to sleep. What is the problem?

Originally Posted by Player 2: Uhh.....Worry Seed? A Meowth was crazy. What is wrong with it?

Like that,but this time it's longer.

A Sableye works for a shop. He sells diamonds and other gems. But one day,he noticed the Cadet Blue Gem was missing,so he went asking for Detective Gastly. They saw a shadowy figure behind them,which disappeared. Gastly replied,"That's weird. Why would that figure sneak behind from nowhere?"

Who stole "The Cadet Blue Gem"?