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>seasons return and map is more open, similar to legends arceus
>focus on exploration, with large areas full of many secrets.
>gyms are a big tournament system like in gen 8 and there are 'challengers' you face in each gym who are also trying to fight the gym leader. they specialize in stats and not types.
>pokemon trading card game is added as a minigame you play with npcs or online against other players.
>holographic cards can be found in various secret spots in the overworld.