Baby Pokemon - Level Range of 1 to Level 10
Rookie - Level Range of 10 to Level 20
Advanced - Level Range of 20 to Level 30
Gym - Level Range of 30 to Level 40, from Low to Peak
Elite - Level Range of 40 to Level 50, from Low to Peak
Elite Four - Level Range of 50 to Level 60, from Low to Peak
Champion - Level Range of 60 to Level 75, from Low to Peak
After Champion there are only Legendary Level Pokemon, and this Tier Is called Master Level (aka Pokemon Master), at Level 100 its Divine Level and only the Strongest Pokemon are at this level, except for Arceus as It have really strong hax.