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So I'm currently creating a cutscene in Pokemon Red and I need to be able to turn NPC's facing direction and initiate battles but im kinda stuck. Been studying Gary's room and can't understand how the battle is initiated/cannot find it. Also the script so far moves the player character and then displays some text, I then want an NPC to turn and face the player, then more text, then battle.
As a side query: Is it theoretically possible to change a tile in the map by initiating a script upon entry of the map to check a flag, if flag is true then change that particular tile in the map data's ram?