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>Both have a legendary pokemon of a specific landmark involved in the beginning of the game
>Each Professor of both regions has a female assistant that is around the same age as you
>Rotom having a significant role in SM, it is also a Pokemon that was first introduced in DPPt
>Both rivals are opposites of each other in a sense, with Hau appearing to be more laid-back and accepting of defeat while Barry being extremely impatient and puts himself before others most of the time.
>Both regions contrast each other with Alola being a more tropical region where it appears to be warm all-year round, while Sinnoh tends to have a much more colder environment.
>Thought it would be fun to point this out, but Alola is based on Hawaii, which is the location of both Diamond Head and Pearl Harbor
>Although not proven, Sinnoh tends to be somewhat of a continuation of Hoenn (Shellos/Gastrodon originally planned for RSE, Gen 4 pokemon being announced several years prior to DPs release such as Munchlax and Lucario, much of the same mechanics in Gen 3 such as contests and the Battle Frontier being implemented in Gen 4), like how we believe Alola is going to be somewhat a continuation of Kalos due to the Strange Souveneir and Zygarde