How to Catch a Diglett in Pokemon Violet

Catching a Diglett in Pokemon Violet is pretty straightforward but requires a bit of patience. First, you'll want to find where Digletts hang out. They love to bury themselves in areas with soft soil, like near paths or in caves. When you're in the right area, you might notice small mounds of dirt that pop up and down - that's your cue a Diglett is near! Make sure you have plenty of Pokeballs. Weaken the Diglett a bit in battle but be careful not to knock it out. Then, throw your Pokeball and with a bit of luck, you'll have a new Diglett friend!

Caught my first Diglett by accident lol. Was just roaming around, saw the ground moving, threw a random Pokeball without even battling, and bam, caught it. Maybe I got lucky but try it out, might work for you too.