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Every major legendary should require as much work to obtain as Ho-Oh does in Colosseum and every sublegendary should require as much work to obtain as the beast trio do in GS.
The games need to have lots of rare and obscure, hard-to-catch Pokémon like Chansey in Gen 1, Misdreavus in Gen 2, Bagon in Gen 3, Mareanie in Gen 7, and so on.
Completing the Pokédex should be an *extremely* daunting, time-consuming, monumental and enormous undertaking.
