Which episode is the famous detective Conan Spice Girl?

What you are looking for is the secret of Conan TV483 Russian blue cat

Episode 483: The Secret of Russian Blue Cat

When Kogoro returned to the office that day, Xiaolan told him that Yingli had come to please him and hoped that this Russian blue cat named Kogoro could be fostered in the office while she was away. Xiaolan entrusted Cat Goro to Xiao Goro and went to school by herself. After she left, a man who called himself Xia Tong came to the office. Xia Tong asked Kogoro to help translate the short message sent by his daughter by mistake. Because the content of the message is like a secret code, Xia Tong can't decipher its meaning. And at the prompt of the cat, Kogoro also found the meaning of the code.