If you do a legit trade from the virtual console version of gen 1 to the virtual console version of gen 2, those question marks are corrected and don't appear. They only appear if you trade from non-VC gen 1 to non-VC gen 2, or if you put the pk1 directly into gen 2 with PKHeX.
Virtual Console: Game Freak Mew
in English
7756 19Posted · Edited by enVias
If you do a legit trade from the virtual console version of gen 1 to the virtual console version of gen 2, those question marks are corrected and don't appear. They only appear if you trade from non-VC gen 1 to non-VC gen 2, or if you put the pk1 directly into gen 2 with PKHeX.