As a low density region player, I try to help friends in high density area (e.g. Tokyo, etc) by inviting them to battles when it is morning their time or midnight (when they have their allotment of daily battle tickets). And since they are so many hours ahead of me, I like to invite them to giant mushroom battles when it’s Sunday in my region, and Monday in theirs, so it extends their giant mushroom play another day. In return, they sometimes invite me to a giant battle when it’s still Friday in my time zone but Saturday in theirs.
So it’s important to exchange postcards to give each other a general idea of each person’s time zone.
When I visited Japan I saw mushroom battles fill up in seconds and have seen the number of players per battle max out. It is crazy competitive in some areas, so if you can, help out your besieged pals in other regions and be grateful that your area isn’t as competitive.