Wait, you got the Latias? Lol good job.
If you're saying you'd rather use the roamer method, I guess that's fine :P
What you would do is confirm your seed and use the radio to advance your frame. To advance the frame with the radio, start at the center and press the bottom-right button on the radio. Each time you do that, the frame advances by 1. After you press the button, drag the circle back to the middle and press the button again. Just keep repeating.