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This applies to any work of fiction with ice powers, but how do Ice Type Pokémon work?
You can't actually PRODUCE cold. Cold is just less heat; the net process of refrigerators and air conditioning systems ultimately produce heat by using energy to make an isolated space less warm. That's why AC is installed inside windows or ultimately vents outside somewhere.
So do Ice Type Pokémon do something with the heat, or what? Energy can't just vanish, it has to be displaced somewhere else or converted. When they use Ice moves to make things colder, where does that heat energy actually go? Many Ice Types have abnormally low body temperatures, so whatever they do they must be doing it constantly. If you walked up to an Ice Type Pokémon, would you first encounter a wave of heat energy around it before getting close enough to feel the cold?
Also, even if we assume Ice Pokémon "produce cold" that still leaves several questions. If Ice Types produce cold like how we produce heat, then wouldn't it make sense for them to bundle up and wear bulky "winter" clothing when it gets hot out? For the same but opposite reason we do; to insulate from the heat and keep themselves cold. So in summer they should wear extra layers and in winter they can wear snow bikinis or whatever.
Wouldn't their blood freeze solid? Do they pass urine in the form of a solid chunk of ice?