>>55372842that's a really interesting read so thanks for linking it, i only know english so i have to rely on janky google translate but the pictures provide enough context. i didn't really learn a whole lot from that, except that fuji actually put mew on faraway island and mewtwo was also in kalos.
i still think blaine would've at least known about it if not outright helped him, his picture is up at blaine's gym (from your link, file 4), which the fame checker in frlg makes a note of this picture too. i don't think it's a coincidence that blaine's gym is on the same island as the pokemon lab, i think that was an intentional design choice. pokemon masters ex (which you will probably say isn't canon), says they researched pokemon together. there's a lot of retcons in the series but i don't think that's one of them. it just makes too much sense.