To check IVs, you can:
- Beat the game. After you defeated everything and everyone you can get the judge function for your phone, which tells you which IVs are maxed. For specifics you'll need to ask someone else as I've not yet gotten to that point in the game.
- Use an external pokemon stats calculator
before you start earning EVs with the pokemon. I'm using
https://pycosites.com/pkmn/stat.php . If you use the EV cheat, set the EV for each stat you used the cheat for to 252. Precise values require the pokemon to be level 50 if it has a neutral nature, 55 otherwise, but even at low levels you should have a good idea if the code worked or not.
- Wait for PKHex to be updated and use it.