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So
>G = Gym
>V = Team Star Boss
>Alpha = Titan
>J = Sublegend
That leaves the stars. Seeing as there are 3 of them and they all converge toward the center, I am guessing they are the final bosses of each quest. That building southwest of the crater could be the Pokemon League, the Paradox crater itself is the final battle for the Path of Legends, and the other star is the final battle with Team Star's leader.
Decent chance the true final boss will be a final exam back at the school before graduation.
