I found it weird that Platinum ended up with all the starters with two types.
Yes, in kanto blastoise is the only pure water type. johto had all pure types, and in hoenn, treecko remains a pure grass type through all of his evolutions.
Yes, and in Pearl/Diamond/Platinum, all starter can perform a super effective hits! like Torterra's Earthquake are super effective against Infernape and Empoleon. that's why platinum is the most game I like!