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:Hoenn and Kanto take place at the same time is a weak bet, but it's mostly because you don't need a time machine to trade between the games. Therefore, they must trade at the same time. Gen 2 and 4 are contemporary because of: A. the Red Gyarados report at the start of DP (which must happen before Gold/Crystal captures/defeats the Gyarados), B. References to Elm's RECENT report on eggs, and there are more, but those are two of the big ones. Persumably, it takes 3 years or so for Pokémon to reach Sinnoh (Assuming by land, on foot) from Hoenn or Kanto.
== Gym Leaders ==