It could be that they're going to go with a fruits theme instead of type puns... and the 'kuro' in 'zaukro' may be a pun on the character's skin color... Which... is sadly something Japan would do. The Citron name may be a "tron" (as in elecTRONic, and the Disney film) pun referencing his robotic features and scifi-looking gym.
"Earth is a silly place. Half the world has no clean water. And the other half has so much, they poo in it." 3DS FC: 2750 1911 5515