Go to the water in pastoria city right under the move tutor and surf until you find a cutout on the top and it should be there
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you do not find dialga in Pokemon pearl
Do not cheat just find a friend with the mystic ticket and a mystery gift and bam you get mystic ticket
First you go to spear pillar then when u come to room with a small pond and water fall find the entrance to water fall and it should be up there
The place where it flashes is where you can find the Pokemon It would flash blue if it was found in the water
you can find them on route 206