ShadowForce720
Well-Known Member
Actually in regards to the mascot legendary, (not sure if the following is actually a story spoiler but I marked as such just in case)Version exclusives are completely inconsequential since online trades became a thing. Sure, if you don't have NSO you won't be able to do any trading until the HOME compatibility, but if you have it then getting something through trade is maybe even easier than catching it in game.
If you have NSO and can freely trade, the only relevant factor here seems to be the box legendary. Unlike previous games, the legendary will be by your side the entire time, so picking the version with the one you prefer will make a lot of difference (in fact, I think this time it matters even more than which starter you will chose).
Post-game tournament include professors. I have no idea if they can be fought before that though.
you apparently get to catch a 2nd one of your versions mascot, so basically that means it should be easy to find people to trade with online to get the other version mascot.