Mr. Krabs was greedy, so Arcetina cursed him for being Greedy. Now he could change types between an ice type and a ghost fire type. Both of which were fun.

As an ice type he had all ice type moves and also Sky attack, as a fire ghost he had all fire and ghost moves and also solarbeam.

He is immune to all damage from anything but bird types and is still very very greedy and rude.

He's also a pirate.