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
By itself, nothing If you have wood, you could make a diamond sword, a diamond shovel, a diamond hoe or a jukebox