Get strength by finding the wardens teeth in the safari zone and he will give it to you.
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Use the HM move Strength.
It is at seafoam islands you must use strength to drop all the boulders down into the water to get to articuno. when I drop the boulders and then I was lock so what do I do.
You can use the move strength in Pokémon to move boulders. You can use strength in FireRed after getting the rainbow badge.
If the boulders are smooth then you need to get one of your Pokemon to learn strength to move it and if the boulder is rough then you need to get your Pokemon to learn rock smash ( both of these moves require HMs to be learnt)
You have to meet other people and take their flags in the Underground.