Thats the only way Nintendo do it. They don't have any more of them if you haven't relised. And they haven't exactly done them everywhere in the world.
And in the Japanese versions, that IS how you get the two pokemon. Thing is Nintendo cut them out of all of the non-Japanese versions
Basically, Action Replay gets you any Pokemon, so you might as well get it and use it since they don't install the secret Pokemon in their other versions.
MecheonBehold, as Mecheon, pokemon master, comes to answer your quetions!
Mew: Can't get Celebi: Can't get due to the lack of the GS ball
In the Japanese version you can get both of the aformentioned pokemon
Mew: Get 150 pokemon, and then go to Celadon Mansion. Go upstairs and you are given Mew. All we get in the non-Japanese version is a stupid certificate Celebi: With the GS ball (Gotten from some mobile phone thing which doesn't exist anymore) go to the shrine in the forest. Boom, Celebi
Amnesia Psyduck? In Stadium, win all of the different tornaments. As a prize for beating everything, you get it. Its a psyduck that keeps getting different moves or something
No, " pokemon master " I already said it. If you had bought Nintendo's Official magazines, it is said everything on pokemon. I've been to the tournament they have this machine to download mew onto your game.
W00T I'd win the tournament with my LVL 100 Alakazam with psychic! HAHA!! I caught all 3 legenday birds with a REGULAR poke ball, now THATS something.
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