It is not required that you beat the Battle Tower to gain access to Stark Mountain, however it does require you to have gained access to the survival area which can be achieved by completing your Sinnoh pokedex and receiving the national pokedex from Professor Rowan.
battle tower ,get tougher complete pokedex and complete stark mountain
We can get other regions starter Pokemon if we defeat the battle tower
Cheril from Eterna Forest Mira from Wayward Cave Riley from Iron Island Marley from Victory Road Buck from Stark Mountain
Just get STRONG Pokemon
No!Palmer is your Rival pearl's dad.After you battle him and get to stark mountain there will be no storyline left.
defeat the pokemon league
he goes to his house that is in the survival area. I think that is the one that i at the left of the Pokemon center, after that go again to stark mountain and go to the place where Buck (that is he´s name) took the stone, there you will find a legendary Pokemon. After all this he will be in the Battle Tower to help you on Tag battles. Note: The second time you go to stark mountain you will be alone, so take some potions and revives. Good luck
he goes to his house next to the Pokemon center in the survival area
Obtain the Silph Scope and defeat it in battle.
after you defeat 20 people in a row at the battle tower he is the 21st one u face
Go to the Survival zone and beat the battle tower
Use your Pokemon to see how many trainers you can defeat in a row.