How do you get Mew on Pokemon FireRed without a ticket?

It is only possible to get Mew on Pokemon Firered (without a ticket) by trading it from another version. there is a diffr whay i dont no tho no acataully the first one is right. now jst maybe but i highly dought it. there is no mew. inless it is a reqaward for the end.

trade one from emerald.

Mew is not obtainable in FireRed.