Cheating King 10 hasn't replied yet. Therefore, we shouldn't let it die, and rather, keep it active for Cheating King to see.
Pay a daily visit the elderly man in a house at the southeastern boundary of Pacifidlog Town. He will inform you if Mirage Island will be on Route 131 that day. If you're lucky, it will appear.
If you see me posting, it's because I've been asked to. Which I guess would mean I'm taking requests.