You mean you can reach level 999?! The 3rd Level Cap Set increases the level cap for main characters by an additional 300 levels! More battles will be added to the Colosseum. (Suggested Level 700-999)

Level Cap increased for the following characters::
Neptune/Noire/Blanc/Vert
Nepgear/Uni/Rom/Ram
Uzume/Older Neptune/IF/Compa
B-Sha/C-Sha/S-Sha/K-Sha

Battles Added:
- White Wing Chocopiman
- Mechamiso Technique
- Ultimate Fusion! Dark Orange
- Silent Whirlpool
- Magigirl Rom and Ram!
- Let's Make Our Dreams Come True!
- Arfoire Δ
- Train Man
- Squeedmonsoon

More details on the official game page of 3rd Level Cap Set ...