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Johto has several great Pokémon, character designs and settings. Yes it has a level problem but unless you're bringing your high/max level team from previous games to sweep the Elite Four and Kanto you can still enjoy the game despite this issue.
Meanwhile HGSS specifically has its own strengths with some of the best overworld sprites in the series, the ability to trade with DPPt right away so you can include Hoenn & Sinnoh in your journey if you want, nothing preventing later generation evolutions of Johto & Kanto Pokémon, reusing the Sinnoh Battle Frontier to expand the post-game options (especially for anyone who didn't have Platinum), rematches with all the Gym Leaders and yes the following Pokémon. They're the best remakes so far for the amount of options given to the player about the type of experience they want.
