For anyone asking about why the app doesn’t update their dex this is actually explained in the app:
IT DOES UPDATE YOUR DEX!
All you have to do is take your pokemon to day care or upload them to Poke Bank and your dex will be updated with the Pokemon you’ve created :)
The app works so smoothly I’m really thankful for it! You can actually create any Pokémon you want even Mew!
You can select any move and even make all the Pokemon shiny, yes you do have to pay but it is SO worth it!
I recommend this to anyone who plays Pokémon!!
JazzandRaidyBoy about AO Creator - Creator for Pokémon, v1.4.1