With the ap freindship scale
I think you have to use him/her in battle and ALWAYS carry him/her in ur bag.
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.
The only way to see Palkia in Pokémon Diamond is to use WiFi. Otherwise, you can't.
Diamond is transparent to non-transparent, depending on the diamond.
A polished diamond is an example of complete diaphany, in that you can see through it.
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There is no Diamond Island on Poptropica. There is a Diamond Mine on Nabooti Island. (see related question)
You can see the Hope Diamond at the Smithsonian Institution in Washington, DC.
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Your answer depends on the individual diamond. Gem-stone quality raw diamonds are much more clear than industrial-quality diamonds. You can see a photo of a raw, gem-stone quality diamond, and learn more about them, below.
You cannot battle Palkia in Diamond however you can go talk to Cynthia's Grandma in Celestic Town in order to see it.