Ugh, always a pain. Just keep catching everyone of those you see, one will eventually morph into ditto. Which one is it, Mew or Meltan quest? If you're doing both try and get Mew to 5/8 and Meltan to 3/9 - that way you'll get two for one!
It was Meltan. I actually caught the Ditto today, caught one of the Racoon things and it morphed into a Ditto.
Was a good day all in got my Gyrados & Dragonite and I'm only 12 candies away from my Blastoise. Making some decent progress though that will be done soon considering I'm back at work from next week

I've added a load more of you from a page back to my friends as I've got to get 3 more friends for next stage of the quest. Also launched another load of Gifts out as I seem to get them every time I spin a pokestop.