Giovanni's Persian is one of Giovanni's Pokemon. It was always seen with its master and Giovanni actually seemed to care about Persian and was often seen petted it. In return Persian was very loyal to Giovanni and went with him wherever he went. Persian has never been seen in battle, instead being treated as a pet. Meowth hates Persian because it was Giovanni's favorite Pokemon. It was stated by Meowth that he used to be the top cat, but was replaced by that "stuck up good for nothing" Persian.
Meowth: Shut up and talk about me.
Persian: You think you're better. And after all, THIS part is about ME not you.
Meowth: SHUT UP YA ROTTEN BIG MOUTHED PERSIAN!
Persian: Make me!
Meowth: I will!