The title says it,,,I personally can imagine Bertha's debut around a snowy place due to her warm clothing scarf jacket etc. Maybe training against elite four Glacia??
What should Hoenn Elite Four do in place like Sinnoh?
But it's good idea seeing Bertha here, I agree with that one...
Why would the Hoenn Champion and Kanto Pyramid King be in Sinnoh? Stuff has been made up for them to do, so the same could happen for Glacia.