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Honestly, I think this makes sense. It's the only country aside from Japan to have physical Pokemon Centres.
While you could make similar arguments for the US of A & UK, they got their turn already. Yes, Unova counts. It's not a 1:1, but that's what makes it so great.
Singapore was also one of the only two countries to have access to Pokemon Masters' Closed Beta, the other being Canada, which is also a lot more likely than any of the things on the list.
If Singapore is too small, group the rest of the SEA gang together. Maphilindo Empire.
It will never be Korea or China. Full stop.