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Trying to make it easier for you now.
Each starter has a theme advantage in at least 1 gym. (the soccer stadium was your easter egg).
Unova. Kalos. Alola. Galar. 9th generation all connected through Norse Mythology. Kalos/Asgard. Galar/Midgard. 9th Gen/Niflheim with Nidhogg & Ragnarok tie. Then transition into Native American lore. (Dig deeper into Unova. Someone finally has. But Unova = East Coast. 9th Gen = West Coast. Native American lore transitions into South Americas.)
Vikings use Aegislash/Horse/Dog pokemon. In post game you can join a faction. (Oh, how special Aegislash is. And dogs. God bless dogs)
Galarian forms include… Unown. (It's literally written in stone).
