Pokemon Legends: Arceus has many new systems and features that deserve to be talked about, as the game breaks the mold of mainline releases in the franchise, which might very well be one of the reasons for its incredible success. The Hisui region is also a fantastic way to pay homage to Pokemon Brilliant Diamond and Shining Pearl's modern Sinnoh through iconic landmarks and a unique perspective offered by the feudal Japan-like setting. Like many of the regions for the mainline Pokemon games, Hisui is also packed with mysteries and references to other games, with many elements coming from Generation 5's Unova region.
Among the most interesting connections to Unova there is Ingo himself, who traveled back in time and partially lost his memories, and paintings representing Unova's Champion in the flesh — Alder. The premise of Pokemon Legends: Arceus is that the main character is sent back in time by Arceus to quell frenzied noble Pokemon, who are the descendants of the ten Pokemon that belonged to the ancient hero of legend — a roamer, like Alder. However, the ancient hero of legend is not the only one to wield more than six Pokemon in battle or as companions in the game, with another major exception coming from Pokemon Legends: Arceus' post-game battle against Volo.
Pokemon Legends: Arceus — New Pokemon Tier List
Mainline Pokemon games have always limited players to up to six Pokemon at a time, which is an in-game rule that makes the choices behind one's team composition ones that matter. And yet, the Pokemon anime and manga do clarify on multiple occasions that this is not so much a rule that everyone should follow, but rather it's stated that a team of six Pokemon is the optimal size to form strong bonds with the creatures
Read more on gamerant.com