Is Ditto rare in Pokemon shield?

I'm curious, are Ditto creatures considered to be rare finds in the Pokemon Shield game? It seems like they could be quite valuable for breeding purposes, but I've had a hard time encountering one so far. Could you share any insights or tips on how players might increase their chances of catching a Ditto in the game? I'd love to know if there are any specific locations, times of day, or conditions that make encountering a Ditto more likely. Thanks in advance for any information you can provide!