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It's pure luck
There's no straightforward sure way of catching a Ditto. This pokemon is one sneaky devil and will hide like other common pokemon. To find a Ditto, you're literally going to have to catch every pokemon in the area until one turns out to be a Ditto. However, to maximize your chances, you can keep an eye on local Discord communities looking for Dittos. If someone in your locality finds one, it's very likely you can find one too there if you're fast enough.
