The Hoenn region along with Emerald and ORAS
My first game was Alpha saphire so it makes sense itd be dear to me but i felt just as strongly if not stronger when i went through Emerald for the first time few years ago when i first properly started getting into the older games, a lot appealed to me about it, people love Hoenn for a reason, the music, special effects, incredibly memorable locations and charectors, some of the best pokemon in the series and the general mastery over atmosphere for the region only relly matched by Alola
ill start with the memorable Locations and charectors