Well, It depends, I don't know what you mean but I think you mean to get into the tunnel right? If it's that then go to Veilstone City, and go south..... And, If you have beaten the elite 4, and has the nationa pokedex, then go south of Veilstone City and there should be a new path to your right, it's called Spring path. That's where you catch Giratina if you want him. Hope I helped :D
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The ruin maniac is a character who gradually digs a tunnel as you progress in the games.
The ruin maniac is under veilstone city in the cave on the left.
i think you shall find in internet seach in youtube im adding on to this: go to hearthome city and go to the route below it you can battle the trainers and youl see a cave on the left go in the cave and youl find a guy obsesed with unknowns (though many trainers go by the name " ruin maniac"
on route 214 by the ruin maniac
get an known for him