NSPCC chief executive Peter Wanless has written to developer Niantic in the hope checks will be carried out.
He said: “I urge you to urgently reassess your app and its security and safety features.
"We all have a responsibility to ensure that children are protected and as creators of a game with substantive reach, you have a weighty responsibility to protect your young users."
The launch date for the game in the UK has not yet been confirmed but was expected this week.