Why didn't I get dive hm?

Question

In Pokemon white 2 serebii says you get dive from hugh in undella town but he didn't give it to me and just fought me instead so I'm here asking why I didn't get it

Comments

- Check your bag one more time to verify.
- Did you beat the E4?
- Did you win against Hugh?
- are you on Emulator?
- Try going up to the gate one more time (this is to rule out accidently not saving after fighting him)
not a full answer, but check this out https://bulbapedia.bulbagarden.net/wiki/Walkthrough:Pok%C3%A9mon_Black_2_and_White_2/Part_11

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Can you show us a video of you battling Hugh and not having the HM in your bag?