First you have to stop Team Magma.Go to the Jagged path and go into the hole you see.Battle Team Magma's leader and then go back to Team Aqua's hideout again and there should be nobody blocking the way.
after getting into team magmas hideout
go to mt pyer <peer>
No only in aqua's hideout.
You get it from the team Aqua hideout.
that is team aqua hideout
First, you have to defeat the Aqua team at Mount Prye, then you have to defeat the Magma team at their hideout near Lavaridge. Then, the guard will be gone.
You get it in The Team Aqua Hideout by Lilycove City.
In a cave next to lilycove
it is in the team aqua hideout by the electrodes
team magmas hideout is where you go down from the cable car, east of lavaridge. aqua is a surf north away from lilycove or mossdeep, i forgot sorry.
in team aqua hideout near lilycove
there is only one and its in the team aqua hideout