There is no crystal structure.
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HeartGold and SoulSilver are the remakes of Gold, Silver and Crystal.
You can't catch Mewtwo in Gold, Silver, or Crystal. But you can catch it in HeartGold and SoulSilver in the Cerulean Cave at Lv70.
Route 38 and 39 in gold and silver, and route 43 on crystal
Mt Silver.
Pokemon Crystal.