Also Farfetch’d (walking), and after Surf – Lotad/Lombre.
A major annoyance in Diamond/Pearl (and untouched in vanilla HG/SS) is honey tree waiting. Sacred Gold/Storm Silver . Instead, Pokémon like Munchlax, Heracross, and Aipom appear as normal wild encounters in specific routes with reasonable encounter rates (10–20%). Pokemon Sacred Gold And Storm Silver Pokemon Locations
In both games, you can find rare Pokémon in specific locations. Here are a few: Also Farfetch’d (walking), and after Surf – Lotad/Lombre