Yup this guide was pretty easy... so basically...

1st round: Use Hinata mystery
2nd Round: use water main mystery on kakashi
3rd round: use naruto mystery on guy
4th round: use water main mystery on kakashi and hinata's mystery
5th round: use naruto mystery on guy
6 round: use water main mystery again on kakashi

*use kabuto mystery whenever availabe except for the 1st round

By 6-7th round you should be able to beat this...