You don't use Honey or Sweet Scent you just use your Dex-Nav.
Use your Dex-Nav of finding a Pokemon with a HA
You can use Honey or Sweet Scent to induce Horde Battles though which have a chance of having a Hidden Ability .
Chaining with a Dex-Nav
Here is a video showing how
You must at least see the Pokemon you are going to chain. For Example lets say you want to chain a Skarmory on Route 113.
First encounter Skarmory on Route 113. After you do so Skarmory will be registered in your Poke-Dex allowing you to Dex-Nav it. Go onto the Dex -Nav and click the Sprite of Skarmory
After you do so find out its search level (How many times you've encountered it)
Keep encountering it until your Search level is a very high number
To increase your Search Level horde encounter that specific Pokemon so your Search level will increase by 5 times a horde battle
Your Chain will break if you walk or move away from the certain route/cave/body of water etc
If you run into a another Pokemon which you are not chaining kill it or catch it and your chain will still continue.
Every 5 chains your Chaining Pokemon's level will increase by one so bring some high-level Pokemon