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Ishihara shat the bed and begged tencent to pump out a "relevant" game using the Pokémon IP, in lieu of sending his own money to hire people who knew how to make games to suit Switch.
You know, because he thought it was going to flop, thus saw no point in investing money in his teams to prepare for the jump to Switch until he needed to (and even then, all his studios have done is ports and remakes).