Where it comes from
The line in the source
僕はデザイン自体には携わっていなくて、仕上がったものを見てみたら「カモネギ」が使われていたので、最初は驚いたんです。 In English
I was not involved in the design itself; I was surprised when I saw Farfetch'd used in the finished product. Ishihara, interviewed with NIGO: the licensee chose the creature; implies approval-after-design, not TPC-led design.