Ok, now to learn an attack you have to be at a certain level. Here is the level chart.

Lv. 2 - PL of 50,000
Lv. 3 - PL of 150,000
Lv. 4 - PL of 300,000
Lv. 5 - 500,000
Lv. 6 - 750,000
Lv. 7 - 1,000,000
Lv. 8 - 3,500,000
Lv. 9 - 5,000,000
Lv. 10 - 8,000,000