A special broadcast has aired on NicoNico and showed a lot of footage of Pokémon Sun and Moon. In the footage a minor feature was showcased of shaking grass. When the trainer approach it, the Pokémon in the shaking grass attack the trainer. Whe you catch a new Pokémon, Rotom will give you a report of how complete is your Pokédex. The Ilmia's trial requires you to look for Alolan Rattata and you will get a Z Crystal for completion. There will be 7 trials.