I can confirm this bug is still in existence (Capture Data too, not just evolution):::
I just happened to be scrolling through my pokedex today to check and see who I should go catch and apparently the pokedex data is still not fixed. I just had to go re-catch a Caterpie (even though I had previously caught him, and even still have credit for the Caterpie into Metapod evolve *star*).
I scroll down a bit more and I'm missing numerous pokemon on my pokedex that I had previously obtained:
-Caterpie obtained (even though I still have credit for evolving a Caterpie into Metapod) [RECAPTURED just now]
-Arbok evolution/obtained
-ZUBAT obtained
-Golbat evolution/obtained
-Diglet obtained (even though I still have credit for evolving a Diglet into Dugtrio)
-Graveller evolution/obtained (even though I still have credit for evolving a Graveller into Golem)
-Electrode evolution/obtained
-Goldeen obtained (even though I still have credit for evolving a Goldeen into Seaking)
Possibly missing more, but a quick 5 minute scroll through pokedex these are incorrect and missing... I had done this previously.