Pokémon qualifications/potentials are divided into eight types:
Red
Orange
Yellow
Green
Cyan
Blue
Purple
Gold.
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Corresponding respectively:
Rookie (Red 0-20)
Ordinary (Orange 21-40)
Advanced (Yellow 41-60)
Pseudo-Elite (Green 61-70)
Elite (Cyan 71-80)
pseudo-Champion (Blue 81-90)
Champion (Purple 91-99)
Legendary(gold above 100)
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There are Ruins and Secret Realms
Secret Realms:
Primary/Normal/Elementary/junior
Advanced
Top tier