Ebay: Signed Pikachu Stuffy. Ken Sugimori. Official Pokemon Merch, Signed By Creator. | eBay
Be careful; the auto looks like a 50/50 chance (signed in 2018/2019?), but this seller told me that there’s proof in an email thread (they “can’t share”) and told a friend of mine that it was during when cameras were rolling (they “can’t share” that, either). Multiple stories.
Be wary of this one.
I can’t think of a worse item to receive a valuable autograph on. 
Man, I would’ve had my Japanese Gym Giovanni’s Last Resort or Japanese Neo 3 Entei card ready to go if I ever could choose something to be signed by him! Two of my dream cards…
I read your comment before clicking the link and thought “surely there’s something worse than whatever this will be.”
Nope, you’re definitely right.
It’s definitely an item where even if it is real I wouldn’t want it
Based off other example of his signature in the last few years, this looks legitimate to me.
If you’re gonna fake a Sugimori, this is probably the absolute last item you would do it on. Not a signature expert, but that combined with the appearance of the signature is evidence for legitimacy.
I think it probably is legit but i bet the evidence won’t add a single thing to help the buyer prove authenticity.
But unless you have a pokemon shrine space it’d be a nightmare to own and display.
Regardless of if it’s real or not, if a seller says they have proof but won’t share it, then they are wasting your time and you shouldn’t entertain talking to them any longer.
My thoughts, too! Just them having proof but not sharing any of it throws me off, personally.
Thanks for the heads up, but for Pikachu I only collect the TCG cards and nothing else (unlike Seviper).
But even if I would have, I agree with what has been said earlier:
Greetz,
Quuador
cause I bumped into him and all I had on me was this pikachu plushie. and you’re not gonna not get Ken Sugimori’s autograph, right?
I also believe it to be authentic. I could picture someone on the set of detective pikachu havjng easier access to a plush then a card/better item.
Altough its kinda irrelevant as at the price point dont think it will ever sell.