yes at the cerulean cave after u beat red
No, you cannot find or capture Mewtwo in Pokémon Diamond, you'll have to transfer it from Pokémon FireRed or LeafGreen or you could trade the Mewtwo found in HeartGold or SoulSilver over to Diamond..
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
Sorry, but you cannot capture or find a Mew in any games. The only way to is to get it by event, or use Action Replay. But to cheer you up, you can catch MewTwo in Heartgold/SoulSilver.
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Mewtwo can be found in the Cerulean Cave in HeartGold.
Get ALOT of ultra balls,weaken it to red,andif you want to use a masterball get 999 with action replay or use the one you obtained from prof.Elm.
cerleun cave
mewtwo
You can't catch Mewtwo in Pokemon Diamond and pearl and also platinum. But you can catch Mewtwo in heartgold and soul silver
Cerulean cave
you dont, its not in HeartGold or SoulSilver, Ho-oh (HeartGold) or Lugia (SoulSilver) take their place. You can also get mewtwo
in cerulean cave at the end