To mark a Pokemon, you need to put it in a PC. Then select the MOVE command. Put the cursor over the Pokemon you want to mark, and press A. A list of commands will come up. Select the one that says MARK. Then you can choose from 4 symbols and order them up any way you like, or have multiples of one kind.
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go to bills PC then go to move Pokemon then click on the Pokemon and go down to mark
you cant
Unown (?)
These Pokemon can be found in the tanoby chambers on seven island these Pokemon look like the alphabet if you look carefully in the monean and viapois chamber you can find an exclamation mark and question mark unown.
All you have to do is fill the Pokedex completeley. There are some pokemon which you will have to trade from white but you can do it.