This skill has to be taught to your Pokemon using a TM that you get as a reward on your journey
where do you find strength in Pokemon blue where do you find strength in Pokemon blue
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In Nimbasa City to the top left of the Pokemon Center there is a house with a blue haired kid in it. Talk to him for Strength.
go to varrock then go in the bank and get out a strength potion u noob
You can get the Strength HM from a blue-haired character in Nimbasa City in the building directly to the North of the Battle Institute.
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)
seafome island in the top left corner of the cave you will need strength
find the Wardens gold teeth in the safari zone and bring them to him
Strenght is an HM move, teach it to one of your'e pokemon. to use it just select your'e pokemon and select strenght.
You can get the HM Strength at Nimbasa City. One of the buildings behind the Poke Center will have a man with blue hair and will talk to you about the HM Strength and will give you it.
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.