Power System

Pokemon Level, corresponding to Spirit Beast Age

Level 1-10 = 10 Years - 100 Years

Level 11-20 = 100 Years - 500 Years

Level 21-30 = 500 Years - 1,000 Years

Level 31-40 = 1,000 Years - 5,000 Years

Level 41-50 = 5,000 Years - 10,000 Years

Level 51-65 = 10,000 Years - 50,000 Years

Level 66-80 = 50,000 Years - 100,000 Years

Level 81-90 = 100,000 Years - 200,000 Years

Level 91-95 = 200,000 Years - 500,000 Years

Level 96-100 = 600,000 Years - 1,000,000 Years

Spirit Master Rank, corresponding to Pokemon Level

Soul Trainee, Rank 1-10 = Level 1-5

Soul Master, Rank 11-20 = Level 6-15

Soul Grandmaster, Rank 21-30 = Level 16-25

Soul Elder, Rank 31-40 = Level 26-35

Soul Ancestor, Rank 41-50 = Level 36-45

Soul King, Rank 51-60 = Level 46-55

Soul Emperor, Rank 61-70 = Level 56-60

Soul Saint, Rank 71-80 = Level 61-70

Soul Douluo, Rank 81-90 = Level 71-80

Titled Douluo, Rank 91-94 = Level 81-90

Super Douluo, Rank 95-98 = Level 91-95

Limit Douluo, Rank 99 = Level 96-98

Between Limit Douluo and God Official, Rank 99.5 = Level 99

God Official, Rank 100 = Level 100

3rd Level God, Rank 101-110: Pseudo-Legendary Pokemon

2nd Level God, Rank 111-120: 3rd Legendary Pokemon

1st Level God, Rank 121-130: 2nd Legendary Pokemon

God-King, Rank 131-150: 1st Legendary Pokemon

Supreme God-King, Rank ?: Peak 1st Legendary Pokemon

God-Emperor, Rank ?: Supreme Legendary Pokemon

Creator God, Rank ?: Creator Pokémon

This is my estimation of how Spirit Beast, Spirit Master, and Pokemon compare to each other. May be inaccurate, and might update it. But for now, that how I envision it for my novel. 

Also in my opinion, the reason why spirit beasts above 100,000 is in great disadvantage compared to Title Doulou is because since Spirit Beasts isn't allowed to become God, they're unable to master the power of law while Titled Douluo are able to. Only Divine Beasts or exceptional powerful spirit beasts with outside help, such as Di Tian who relied on his 2nd Soul Core which is Yin Yang Core, to be able to use laws.