Bump. @boaz contacted me earlier today with a new discovery regarding the March 1, 2011 set. Apparently there are (at least 
) three different copyright versions available: ©2010, ©2011, ©2013.
Here a side by side of the 2010/2011 Oshawott cards from that light yellow 2011 set:
And here also a picture of the ©2013 version for the Timburr, Litwick, and Tepig of the same set:
As mentioned in the article, there were already three known sources for this set back when I made my edit in 2019:
which might explain the 2010 vs 2011. But where the 2013 are from, I honestly have no idea.
If anyone has any info (@hayo again maybe? 
) lmk, then I’ll properly update my article with this newly discovered information and pictures.
(I for one am glad this discovery wasn’t made for one of the sets that included Pikachu. 
)
Greetz,
Quuador