>>54700086It is probably the best part of SWSH but it isn't THAT much better, if you utterly dislike SW it doesn't really fixe any of the issues aside from the new maps being more visually interesting.
IoA i honestly think is more for Replays then being endgame content, but does have Restricted Sparing (You can only use Pokémon of one type, and Legendaries/Mythics are Banned IIRC).
CT is a really good/easy source of Box Legendaries with the Dynamax Adventures (One of each per savefile for each one) considering how fast you can do it (You can get just about everything but Necrozma and the UBs before becoming champion), and if you have the shiny stone the Shiny Rate isn't that bad in them either, and since you have 100% Catchrate you can also Balltism those old Legendaries easily.
With the two together you can also replay the game really fucking fast since you can just hit Wil Area, go to CT, job to peony and do a Dynamax Adventure or two for Level 70 Legendaries or Level 65 Normal mons athat obey you and then stomp the rest of the game. Compared to "Flying in the Sky" and ULTRA CHANGES it is probably the most streamlined way to get old Legendaries to date.
Star Tournament is basically just the Champion tournament but with doubles and the DLC trainers (Mustard,Klara/Avery and Peony) added into the mix.