"The Pokemon may be naked, but you shouldn't be. It's cold out there," ACC warned.
The ACC statement follows an official warning released by police, who asked players to watch out for "real-world hazards" while using their phones to hunt Pokemon out in the community.
"Never use your phone while driving, don't step into the road without looking and watch out for others."
Meanwhile, local councils are getting in on the fun, with the Matamata-Piako District Council posting a mock warning to locals.
"Animal Control [has] been inundated with reports of rare Pokemon in our parks and reserves," the post reads. "But all we found were teenage zombies."
The mobile phone game was released in New Zealand last Wednesday.
It's since been released in the United States and Australia.
Some UK residents have reportedly tried to bypass their local servers to access the game on New Zealand and Australian servers, which has caused problems for users here.