I'm writing this as near me there is a lake along with a wood around it in North Yorkshire, England that reminds me of the location in the 4th movie Pokemon 4ever where Celebi was. It is known as Gormire Lake and as there will be a lot of people here that will have never heard of it here is the Wikipedia page.
It's strange as the next movie was based on Venice, Italy with Latias and Latios.
by Jonathan01990