Route 105
As you agree to help them, they show you the ropes of how they work. The bulk of the work, let's be honest, is quite boring. They pick an square area to examine, plant a bunch of sticks around it, and draw lots of strings to make a grid. Then, they slowly dig through each square slowly, noting anything artificial they find. Thankfully, they spare you from most of the hard work, just asking that you walk around the area with your Growlithe to seek strange scents.
After an hour, Fred stops digging to start preparing the evening meal. Not long after, your pokemons stop. At first, you think the smell of food is distracting them, but then you notice their ears twitching.
Following their gaze, you see a dust cloud heading toward you... Expect there's no real wind. Professor Otis looks at the cloud, and grows pale. "Swarm!"
Indeed, as they come closer, you see the cloud is actually a swarm of Kricketot, racing toward you.