With the ap freindship scale
I think you have to use him/her in battle and ALWAYS carry him/her in ur bag.
Diamond is transparent to non-transparent, depending on the diamond.
No, you cannot see every Pokémon in the National Dex in Pokémon Diamond however you can see every Pokémon in the regional Sinnoh Dex in Pokémon Diamond.
Diamond is transparent to non-transparent, depending on the diamond.
The only way to see Palkia in Pokémon Diamond is to use WiFi. Otherwise, you can't.
A polished diamond is an example of complete diaphany, in that you can see through it.
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near sendoff springs
There is no Diamond Island on Poptropica. There is a Diamond Mine on Nabooti Island. (see related question)
12th January snow point city
You can see the Hope Diamond at the Smithsonian Institution in Washington, DC.
You cannot battle Palkia in Diamond however you can go talk to Cynthia's Grandma in Celestic Town in order to see it.