What are all the pony club secrets books in order?

There are no official "Pony Club Secrets" books. It seems you may be thinking of a different series. Can you provide more information about the books you're looking for?

For example:

* What are the main characters' names?

* What are the books about? (e.g., horse riding, a boarding school, a special talent, etc.)

* Do you remember any specific details from the books? (e.g., a particular horse's name, a memorable event, a special location)

With more information, I can help you identify the series you're thinking of and list the books in order!