>>36192365In mario gameplay comes from new uses of old mechanics. Also Mario 2 was extremely different from the first Mario. Mario 64 was even more difftent, and really every 3D Mario game from that point on had a new gimmick. Mario 3 and mario world introduces several new power ups, enemies, the overworld, and did things the NES just couldn't.
The same does not apply to Pokemon. You can rearrange the overworld all you want, but tackling down a pidgey is the same from gen 1-7.
