When I first played through it I used my master ball on ditto :/
Do you know how much of a f*cking pain it is to catch him without it? Had to bring him down to almost no life and put him to sleep. I think I tried like 20 times.
but now impatient with video games too XD
Did you try to use strength to get the keys off the table in the slot machine house so you could open the truck that's parked next to the S.S. Ann to get mew? Because I did and it didn't work I was so pissed