The original Pokémon Worlds 2017 rules that were available for download contained a few slight errors. Updated data is now available. If you have already downloaded the rules set, please download it again. You will have two rules sets of the same name; please choose the one that shows that all Pokémon will have their level set to Lv. 50 automatically. Thank you for your understanding.
Source: Pokémon Global Link
Pokémon Blog 