Shikamaru Ninja
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Technically the only games they developed weren't developed just by them so with pedanticness, my statement is still factual , but yeah I conceded that I forgot the Stadiums development hours ago.
The Stadium games were done by EAD. You can cross-reference the entire staff and they are long-time EAD members. The only contract staff were the "Pokemon Center Modelers" which was a group hired by Nintendo to work on 3D models on a temp basis. Also those Pokemon Mini games were developed purely in-house as well.