Investigation Notes is the monster book in your menu. Each monster has Studies, such as hunting it for the first time or breaking its parts. Completing them counts toward the Investigative Journey, which reveals hidden monsters in order.
If a visage says its monster has not been unlocked, the monster is usually on this list. New ones open at weekly resets.
| Monster | Objectives | Needs first | Week | Eco Rank |
|---|---|---|---|---|
| Radiant Paolumu | 150 | 5 on Pink Rathian | 6 | |
| Radiant Tzitzi-Ya-Ku | 180 | 5 on Radiant Paolumu | 13 | 7 |
| Radiant Odogaron | 210 | 5 on Radiant Tzitzi-Ya-Ku | 15 | 7 |
| Radiant Diablos | 240 | 5 on Radiant Odogaron | 18 | 8 |
| Radiant Rathalos | 270 | 5 on Radiant Diablos | 20 | 8 |
| Radiant Legiana | 300 | 22 | 8 | |
| Radiant Radobaan | 330 | 5 on Radiant Legiana | 24 | 9 |
| Radiant Pink Rathian | 360 | 5 on Radiant Radobaan | 27 | 9 |
| Black Diablos | 390 | 5 on Radiant Pink Rathian | 30 | 9 |
| Radiant Black Diablos | 420 | 5 on Black Diablos | 36 | 9 |