Microsoft translator:
>One book to enjoy the first appearance of Pokémon & characters with the popular vote ranking in Arosa! That character that was high by far the vote rate is... Special Event!
Google Translate:
>One volume that you can enjoy with Pokemon & Characters, who first appeared in Arora, with popularity voting ranking! That character whose vote rate was high with no doubt ... Also special project!
You get the general gist
It's a ranking of the most popular Alola Pokemon and characters
Lillie obviously won the human character poll, so they're doing something special for her
