I can't get into the cavern blocked by team Aqua where you dive and see the submarine.
I have beaten Magma south of Lillycove
And in the Space building in Mossdeep.
"A punk like you, do you really think you can take on Team Aqua? I'd say you're too early by about a trillion years! You're a perfect fit for the likes of Team Magma! Speaking of Team Magma, I hear they were spotted in Mossdeep. That bunch of goons, they sure don't look good near the sea!
I have been stuck on this for weeks now and nobody seems to want to help in-game chat. Thankyou