The only way to catch either one of them would be to transfer from an other game, since they aren't found in Pokemon pearl.
To catch Mewtwo in LeafGreen or FireRed no. To migrate Mewtwo from LeafGreen or FireRed to Diamond/Pearl/Platinum yes you have to have it in Diamond/Pearl/Platinum.
You will be hugely happy :]
You can catch Articuno Zapdos and Moltres in Diamond Pearl and Platinum after you get the national dex and talk to Professor Oak in Pal Park. They'll be on the poketch map. As for Mew and Mewtwo well...Mewtwo you can catch in FireRed or LeafGreen after you beat the Elight Four see 60 some Pokemon and get the ruby and the Sapphire from the 2 islands (forgot the name of them) then go into the cave in which the guy was blocking and Mewtwo will be in there. Then just migrate it to Diamond/Pearl/Platinum. I don't know how you can catch Mew however without either cheating or going to an event.
The highest level Pokemon you can catch is a level 70 Mewtwo.
if you have the action replay
You can't catch Mewtwo in Pokemon Diamond and pearl and also platinum. But you can catch Mewtwo in heartgold and soul silver
I don't think so. No you can not catch Mewtwo in Pearl, but you can receive it in a trade.
Mewtwo is not obtainable in Pokemon DPPt. Trade it over from another game or AR.
No two Pokemon make mewtwo ,you must catch it in firered or leafgreen and if you want you can migerate it to diamond or pearl.
You can't get Mewtwo in Pokemon Pearl.
how do you catch a mewtwo on Pokemon platinum
well you can but you can't catch Pokemon in the game so you have to download it from Pokemon diamond,pearl,or plantinum.
yes,mewtwo is in Pokemon dimond/pearl
You can't get a Mew unless you cheat, I think. A Mewtwo you can only catch in Fire Red\Leaf Green and transfer to your Pearl.
No you can't catch Mewtwo in Pokemon silver, you must trade it from Pokemon yellow.
You can't catch mewtwo in pearl, but you can transfer one through pal park if you have one in firered,leafgreen,ruby,sapphire, or emerald. Or you could use cheats to catch mewtwo in pearl
To catch Mewtwo in LeafGreen or FireRed no. To migrate Mewtwo from LeafGreen or FireRed to Diamond/Pearl/Platinum yes you have to have it in Diamond/Pearl/Platinum.