Storage glasses glass

Kingdom hearts questions? - blade style key for all cars

Ok, well I've traveled throughout the game, I have about 10 species of the blade of the key, so eh .. When can I return to Monstro? Since I can not go back, said only that Dingo hes gone and we leave before he returns. So when I got back to monstro? How can I overcome, and Lord Hades? hes nearly invincible.