I may explain them in future.Now I just List them with no explanation.

7.Chronosapiens

Chronosapiens are a species of biomechanical lifeforms. They're robotic, metallic, and appear to be more machine-like than biological.

Chronosapiens can Manipulate Time at their wills.Their Time Manipulation Range is Multiversal.

But Their potential is very limited.Some Times Powerful characters can break it.Also All Chronosapiens are not equal in Power.

6.Atomix (Unknown Race)

Atomix has a humanoid robotic appearance that is taller than Negative Ultimate Humungousaur. He has a green and white body. He has large cylinders on his arms, near his wrists, that are full of a green energy with dark green bubble-like spheres, and these spheres constantly move on Atomix. He has the same energy on his Omnitrix-shaped chest. His mouth doesn't move when he talks and his head is a pointed, armored helmet

Atomix easily beat 2 ultimate aliens Ultimate Humungousaur and Ultimate Spider-Monkey.

5.Anodite

Anodites are a free-spirited race of humanoid energy beings from the planet Anodyne. Mature Anodites are pure energy and draw life from the mana around them

They Can do Mid-Level Reality warping.

4.Diagon

Diagon is an extra-dimensional demonic entity who tried to invade this dimension with the help of his Lucubra army during Earth's medieval era. He was banished back to his dimensionwhen Sir George defeated him by cutting out his heart with Ascalon, a powerful weapon given to him by Azmuth nearly one thousand years ago.

His heart alone is said to have the power to reshape the universe itself, and he claims that but never shown any universal feat.

3.The Contemelia are an alien race of neutral, cosmos-travelling "observers", and the original creators of the Anihilaarg.They are 5 dimensional being.

2.Naljians

Naljians are 26 dimensional(11D via M-Theory) beings.Their Child Toy Surpass Omnitrix.

They are the 2nd Most powerful aliens in Ben 10 franchise.

1.Celestialsapiens

Most powerful alien race in Ben 10.

They are Multiversal level characters.All Celestialsapiens are equal in terms of power.

Celestialsapiens may have All kinds of Power.But They are not Invincible.They have weakness.Their Greatest weakness is Their personalities.