The Isle of Reincarnation is a legendary place said to be the home of several legendary monsters, including Phoenixes.
This is quite possibly the island that Niton recounts to the Searchers during his fictitious account of how he retrieved the Phoenix mystery disc. The disc (and the story) turn out to be fake, but the fact that it is a beautiful island that includes a volcano may mean that it's the same one.
In My Monster Rancher, it is one of the special Adventures that you can take, recommended for monsters Level 11 or higher and unlocked only from April 27th - March 9th (in real time). The Island has 5 parts, each with their own potential treasures and bonuses:
- Deep Coastal Fog (30 min)
- Jungles of Forgotten Time (1 hr)
- Gusty Mountain Path (1.5 hr)
- Fire-Swept Crater (2 hr)
- Nest of the Phoenix (6 hr) Its boss is a Level 12 Phoenix named Red Sun King.
For more details, see HERE-->[1].