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>great world design
>great music
>abilities
>gen 3 and 4 moves/Pokemon
>physical/special split
>added the features removed from the gameboy games
Gamefreak really outdid themselves here. They took pretty much all the best things about the previous 3 gens and included features from gen 4. Adding following Pokemon was brilliant and it shouldn't have taken this long to get them back. Everything about HGSS was peak Pokemon.