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Yeah...

You basically click on an icon that looks like this:

http://i856.photobucket.com/albums/ab121/tengyang5334/egg_zps44h2fxld.jpg

from your inventory and "use" it to "unlock" the pet.
...

I don't think so.

For example, If I'm using +150 S-Atk Saiki units, and +200 S-Atk mag, then I better switch to S-Atk Switch Strike. In the Candy Box, I should be installing inside them Power...