Charmander spawns at Highmark Stadium

So I have been trying to keep track of when Charmander spawns and I think I may have figured it out (kind of).

Every time I have found one and every time I see them on fastpokemap.se it is between the 45th-50th minute. I have not seen one at all at any other time at this location.

The only thing I havent figured out is what hours they actually spawn since it is not every hour. These times I have found 1 (sometimes 2) every time 7:50am 9:50am 2:45pm 6:45pm

I am going to try to get a more in depth analysis of this location in the coming days if anyone wants to try and help.

Go get your Charizards people

Edit: There at 7:50pm