Question

In Omega Ruby, where on Route 123 do I find TM 99 (Dazzling Gleam)?

Answer 1

Talk to this girl, and she will give you TM99

Answer 2

The Dazzling Gleam TM is on Route 123. Just go to Berry Master's house and keep going right a bit, and you'll see a little girl with a pink hat. She gives you the TM for free.

Source: https://guidestrats.com/pokemon-oras-tm99-dazzling-gleam/