Go to the Solaceon ruins in Solaceon Town and you'll see a boy. Talk to him and he'll say you got to go to his house and he'll give you the seal. Catch some Unown in the Solaceon ruins.After that, go to his house again. Put the Unown in the first place in your party (meaning it'll be the one to be sent out first in a battle) and talk to his mom to get a seal case. Next, talk to the boy and he'll give you seals like the unown you got. Example: If you catch a Unown C, you'll get 7-8 "C" letter seal. You can show more than 1 different Unown. You can also buy various seals in Sunshyore City, once you get there, there is a big market that has a signpost saying
'SunyShore Market'
A selection of the world's seals.
This market is just above the blue pokemart.
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you do not find dialga in Pokemon pearl
You can find Aron only in Diamond.
Well, you can't find Smoochum in Pokemon Pearl unless you transfer it from a GBA game. Sorry.
in the pokecave you have to find the rare pearl
sunnyshore market guy who sells different ones each day