As I said in the OP I mostly only included Pokemon that I could find first-hand confirmation for in the new image. In older images I added everything I could find people talk about and just marked all the Pokemon that I couldn't find a source for.>>42574603
Found a direct source on that. It also looks like he came up with the concept for base Necrozma too. Added.>>42572644
I feel unsure about adding Bruxish. He did draw the final concept art for it, but I think things get awkward once you start considering even smaller contributions to the design like that for the list. Like, the design lead (Sugimori in Gens 1-5, Ohmura in 7, Turner in 8) has input on everything brought to him, including things like Sugimori insisting Snivy have limbs, but we're not considering Sugimori to be one of Snivy's primary designers.