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>Takes place in Sinjoh, you can explore some Kanto, Johto and Sinnoh areas (also Hoenn/Sevii Islands if you want to add more)
>100 new original Pokemon, 20 new variations like Regional Forms, only 6 new legendaries (main duo, small trio, either thrid of the main duo or Mythical availiable postgame)
>Regioinal forms can be breeded if you mix the father (you can get a Galarian Zigzagoon if the father is a Dark-Type, or a regular one if the father is a Normal-Type)
>Simplify evolution methods so you don't need extremely rare items to get a single evolution
>Explorable land, sea, underwater, sky (like soaring, but allowing you to reach high mountains and have aerial battles as well as finding various Pokemon and other things on the sky), Ultra Space and extreme temperature places (if you have the correct Pokemon for it)
>HMs return as Pokemon natural abilities after achieving certain levels (a level 1 Charmander can't cut a tree, but a level 14 can, or it can simply burn it down; same for a baby Mudkip which can't carry the player but a Marshtomp can, and a Swampert can go even faster)
>You can buy battle music from other regions and use them for online/postgame battles, as well as battle scenarios
>Title Defense and Battle Tree mechanics return
>Single, Double, Triple, Multi and Royale modes return as well as options like Neutralizing Gas mode (no abilities), Mono Cup, Inverse battles and custom rules
>Player is limited to Gym Leader's Pokemon quantity and items
>Returning Contests, Secret Bases and Safari Zone; daily Dream World to obtain certain Pokemon with Hidden Abilities
>Stadium Mode in main menu where you can import ingame, prebuild or downloaded teams and battle against your friends or online
>Legendary and Mythical Pokemon appear once you get certain achivements or conditions and have their own areas (Mew once you complete the whole Kanto Dex, it roams the region; Celebi after obtaining the GS Ball; Manaphy Egg after discovering some underground ruins, etc)