Obedient Mew?

[Gex]

Hey everyone pretty new to the emulation front. I can’t seem to figure out a good way to get a mew that listens on firered. Any advice or help on the subject? 

[Shady Guy Jose]

For a Mew to obey in Gen 3, it has to be from one of the official events that distributed it at that time. A Japanese Mew caught in Faraway Island, for example, fits that bill. Or the 10ANIV distribution. If you're on this forum, I assume you've stumbled upon PKHeX, the save editor we use here. If you open your save there and go to the encounter database, you'll see possible Mews there. They won't have your OT/ID, so you'll need enough badges, though, of course.

[Gex]

And I can do this on an iPhone or android? 

[Shady Guy Jose]

There might be ways on Android that I don't know about. But the cleanest way is for you to use an actual computer, transfer your save there and edit it with PKHeX.