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Yea I had a ds and the orginal action replay ds and it broke that aswell.  So I asked a gamestop manager if an action replay dsi would break a dsi and he said it destroys the save/sav(I don't know what its spelled like) files and can damage the dsi by accident, therfore breaking it.
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Just be patient.  Inflict a status condition, damage it into either red or orange, and use the best type of pokeball for the situation (ex. In a cave or at night use dusk balls,  or quick balls at the beginning of a battle.)
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You would have to migrate pokemon to catch them all.  but to get all the data in the sinnoh dex you just need to battle every trainer along the way to the elite four and then afterwards go battle/ catch Rotom in the old chateau in eterna forest.
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I just used 3 main pokemon.  I used my Starter Empoleon lvl59  (58 when I started).  Garchomp lvl 56 and Giratina lvl 56.  If you battle as many trainers as you can until you get to the elite four you can have an entire team of pokemon lvl 53 if you start from the beginning.  Plus you'll have enough money … Read more