To get it you have to get(either migrating from Pokemon ruby, sphire or emerald) regirock, registeel and regice on your team. After that, go to the mansion in snowpointcity. Go in it . When you get to the bottom, regigegus will be asleep until you activate it by pressing a on it.
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Pokemon diamond
A diamond. That is red.
What is cttw diamond
diamond
You can use an iron, gold, or pre-existing diamond pickaxe to mine diamond ore or diamond blocks