Depends on it's nature allthough usually it likes blue pokeblocks or pokeblocks with dry qualities.
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Pokeblocks can be made in the Pokemon contest buildings at cities such as Lilycove,Verandtruff..etc..so you really dont need a link cable..
You can't. When you have altered a pokemon's condition with pokeblocks the change is irreversible.
It took me 6 kelpsys and 1 wiki (pokeblocks made in lilycove)
Make sure you have a pokeblock case and go in any contest hall and look for the blenders. Press A and you can berry blend, it creates one pokeblock.
Feed best pokeblocks to your pokemon, Teach best moves for the contest your entering and just use the right moves at the right time.