5 Players in your team vs 5 other players in OU / UU / NU / LC / Doubles. Everyone battles at the same time in their respective tiers. As for the second question, people consider Doubles as a gimmick, hence why it's called a format instead of a tier.
He's confused on why 128 man tourneys are not having shinies like before. All the effort put into making multiple comps for a big tourney just to win a regular comp that you can easily make doesn't seem worth it. It'll be untradeable as well which makes the prize less appealing than it already is. It's viable though, so props on picking Lilligant. It would be nice if the community heard from higher staff members on why tourneys aren't as they were before. What caused the change? Etc etc.
A message from our brethren Juniour:
"Sigh..smh...sigh...shaking my head my head... zymojin. u always XD now and never say anything else.. idk, i am in grief of this. you used to read to me at night about how you can see me at night when I smile but now u don't even do that anymore..! man...! :( :( D: aaaaarghh! "
That was the last time we ever saw that man. Hope you're happy nabgen.