This is because you are not to be able to enter the Spring Path at that point in the game. You can probably head back after you beat the Pokemon League. What is so special in that cave....there is an item there that allows Giratina to freely go from original form and back.
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You have to have a Pokemon that knows mean look or block. Then use the move and they wont be able to flee.
u have to see 210 Pokemon to get the national pokedex from rowan
if u killed giratina in the distortion world here is how u get it in turn back cave ]]]]]]]]]]]]] first you need to beat Cynthia then she wont block the entrace to turnnback cave then u have to see 4 pillars in turn back cave then giratina will be there HOPE THIS HELPS!!!!!
they break the action replay so u can use it on diamond and pearl but if u put it on platinum it will break and wont work on anything....SO DONT USE ACTION REPLAY ON PLATINUM
it wont do any good like you can only use it to get darkri in platinum or pearl