In one of the next versions of Gen 4, Community GO News, a dataminer, has found Gen 4!!!
All the information I’m getting is for future versions.
The last version that I took out was 1 week ago and it was 0.119.2 of Pokemon GO.
Now, I can not confirm if in that or the next one.
But Generation IV, is included!
(1)
He also found these:
“Badge_pokedex_entries_gen4_title”
“Register_enumeration_gen4_title”
“Sinnoh”