>>21896300Nope, you can't upload them, it's the same at VGC Nationals and other official competitions. I think the idea is that you can show your last battle to your friends while you're at the event, but they don't want to risk things like Pokécheck being able to analyse them like last gen.
>>21896313Yeah, it's what I used at Nationals (and spent a few months beforehand testing) and it worked a lot better for me than other, more standard teams. I didn't expect to do particularly well, but anything else would literally have just been throwing together some standard Pokémon and trying to fill in the holes, which never worked out so well for me.