Escape rope don't fight with anyone Don't Kill your self
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Escape rope is a pretty good option Or a Pokemon with the move dig. Or faint all you team's Pokemon.
get the gold teeth in the safari zone then give them to the warden he is in the house right to the Pokemon centre then you give him the gold teeth and he will give u strength!!!!
Get HM Strength from Riley (blue guy) standing outside Iron Island. (Take the boat from Canalave City)
Strenght is an HM move, teach it to one of your'e pokemon. to use it just select your'e pokemon and select strenght.
Correction: it is an HM, but it is in Nimbasa City. The house behind the Pokemon Center, a blue haired guy will give it to you.