Part 1: Making The Second Main Series Game on the DS
Masuda says he always wanted to make 2 titles for the DS (Being Gens 4 and 5), especially because the DS is so popular worldwide. There were very aware that having a second title on DS could mean the games would feel the same, and have done their best to avoid that with these games.
He realised ideas like "Go to a Pokemon Centre and trade" were fixed in his mind and did his best to break them down, because he's been working on the games since the start. They took this as an oppurtunity to re-evaluate rules and systems in the game.
They wanted to make the games more accessible to older players to lower the number of people who were "growing out" of Pokemon. Stuff like adding Kanji to make it easier to read.
The producer of the games (Iwahara (?)), was very happy when Masuda suggest all these radical changes to the games. He says even he had the idea that each generation of Pokemon games had to come out on a different system, but because of the DS's long life and popularity worldwide he was glad for the freedom that creating on the same platform gave them. Iwahara, who Iwata calls a 'veteran' of the series thought "Can it be changed that much? Can we really pull it off" when Masuda told him of the changes that he wanted.
Sugimori thought Masuda's suggestions were a bit crazy. When he was told all the Pokemon would be new he said "Gimme a break! Couldn't we lower the number a bit?" but Masuda refused to budge. Iwata comments that Masuda is stubborn, and Masuda agrees.
Part 2: The Brand New World of Pokemon
Sugimori said he was resistant to Masuda's ideas, but also says that he knew Masuda was not mistaken. There were around 200 pages of planning sheets for new features, explaining exactly what crossing a bridge would mean, or how we'd show the player going into someone else's game world. They didn't do it with DP this way, in fact this is the first time they have. This was to do with all the new challenges they were facing with these games. Once again, they confirm that they used New York as a motif. This was primarily to fulfill the goal of giving these games a new feel, and also so he could have a concert there (like they do in Japan in the region where the games are based off, using music from the relevant games. Apparently), but it might be impossible this time. After deciding this they began deciding where to place towns etc. In doing so they visited the Museum of Modern Art.