There is no Trainer Tower in Pokemon Pearl. It is only present in Pokemon Leafgreen and Firered and Pokemon Emerald. There is however, a Battle Tower in Pokemon Pearl which is basically the same as the battle towers in Pokemon Ruby, Sapphire, and Emerald.
a trainer has one in battle tower
get your own.
A Trainer you meet on Route 214.
NAOOOOWWWWWWW
none
Only the trainers in battle tower (the battle tower trainer's Pokemon will not be recorded in the pokedex)
it has to be by your self or it don't count
in the celestial tower
in the battle tower
At stark mountain
Garchomp go in the Pokemon league the last trainer of it.
after you beat them your free to do whatever like catch legendary Pokemon and get your trainer card to change color by getting stars, and you can go to the battle tower!