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i think HGSS had the most content after the main game, you get to revisit kanto, like the original silver and gold, and you fight the gyms all which have almost similar level pokemon to yours, still a bit to explore, then after you beat all 8 gyms of kanto you have mt silver where you fight red...
On my black and white 2 file i had genesect victini keldeo and meloetta along with celebi manaphy and other legendaries i imported from older games, except mew since i never was able to get a mew event, i deleted my entire save file thinking all my legendaries where still on pokemon white, a few...