To get past you need to have:
Beat Team Rocket in Mahogany (Lance found at the Lake of Rage will tell you where the entrance is)
Beat Team Rocket in Goldenrod
Beat the gym leader of Mahogany, Pyrce.
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You can but only after defeating the red gyrados.you find him in the poke mart thing in mahogany town...
you dont you go up to route 43 i think it is and then to the lake of rage. go north from mahogany town to the building and go out of it north.
You have to defeat pryce the mahogany town gym leader and defeat the team rocket people in the goldenrod city radio tower .
catch entei and raikou
when you beat the people in the poke mart basement and (optional) the mohagony gym, go to goldenrod and beat team rocket in the underground and radio tower. the guy should move after you disband team rocket.