My friends and I were at 414 Pub and Pizza on Mill Ave in Tempe, AZ and caught a remoraid but it was actually a Ditto. Is this a random thing or is this a new option for Ditto now?
Ditto can come from a set number of pokemon. No others.
During events this rule might change. This is mostly because all pidgeys and rattatas etc you normally see are changed to the current event spawns. So that remoraid could be a pidgey and that pidgey happened to be a ditto.
(just look at event spawns just as an event ends. You’ll see them change back to normal spawns).
Last part is kinda vague but the straight answer to your question is: No.