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You are all blind and useless.
No2 is how they are in Unova.
Not really. Unova has seasons, and besides places with snow in the winter, the only place shown to be "cold" is the Giant Chasm. Unless you count the UNova in Black in White 2, then it's really cold there.
I'm more talking about the tree style, and it's possible to be a colder place but still have seasons :P
Aesthetically pleasing to do trees by their actual form, BUT we unfortunately have to also take labour into consideration...