Yes, you can teach it Superpower by bringing it to the Move Tutor in B2/W2. Not sure about X/Y... I'll check.
Chat with our AI personalities
Yes
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U.S, & Russia.
The USA and Russia were the two main superpowers (although Russia did not have much of a Navy at the end of the war, it was mainly a air and land based superpower). England was still a superpower, but, it was in decline and many of it's colonies would soon get their freedom. France, mostly conquered by Germany, was not a superpower, although it continued to act as though it were, and it lost most of it's colonies after the war as well.
USA