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>A new grid-based battle system that incorporates area of effect, elevation, and battlefield objects.
>75 new Pokemon, 15 new Megas, 8 new regional variant lines, 10 cross-gen evos. Regional Pokedex is ~450.
>An open world that encourages you to explore the countryside.
>Gyms that center around themes, not types.
>A new mode that allows up to four players to team up and take on difficult dungeons together.
>Pokemon based on earthworms and deep-sea tube worms
>Fossil mons that focus on recently extinct animals, namely the Dodo and the Tasmanian Tiger.
>Varied sidequests to add flavor to the world.