Click "Generate" and then find a desired Pokémon from the results.
Step 2: Set Up Mystic Timer
Open Mystic Timer.
Choose the Gen 3 tab.
Select the console you are using.
Input the target advance from PokeFinder for the desired Pokémon in the "Target Frame" box.
Click "Set Timer", then "Start".
Step 3: Calibration
When the timer reaches 0, reset the game by pressing Start + Select + A + B.
Open the in-game menu and go to your party.
Select the Pokémon with Sweet Scent and hover over "Sweet Scent."
Wait for the second countdown to end, then press A.
Catch the Pokémon and use the IV calculator under filters.
Input the Pokémon's info to check its IVs.
Select "Any" for the Encounter Slot and click "Generate."
Search for the Pokémon you just caught and input the advance you hit in Mystic Timer.
Click "Set Timer".
Step 4: RNG the Pokemon
Now that you've calibrated for delay, it's all about timing.
Keep catching Pokémon and checking what advance you landed on.
Adjust Mystic Timer if needed.
If off by one or two advances, try again without changes.