Pokemon is extremely different to most RPGs. It is extremely hard to balance typing etc. as they need to think about levels of pokemon, species etc. Which all account for the overall difficulty of the game. Water Types are common because the early gyms are usually weak to water, and plus, as Hoenn is based a lot on water, People would need access to water types for surfing. Team Aqua is primarily based in a submarine, and it would make sense if they used water types. If they radically changed typing etc. then it would divert from the original idea of having a 3ds remake of the original games, and if this was the case, IGN would just say it isnt really a remake and perhaps give it an even worse score. [spoiler]Oi dont dog[/spoiler]