Potential:
Grey - Bad (E)
Orange - normal (D)
Yellow - Decent (C)
Green - Good (B)
Blue - Great (A)
Purple - Superior (S)
Gold - Supreme (SS)
Black - Legendary (SSS)
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Pokemon Tiers:
Level 1-10 (no tier)
Level 10-29 (Beginner)
Level 30-39 (intermediate)
Level 40-49 (Advanced)
Level 50-59 (Pseudo King)
Level 60-69 (King)
Level 70-79 (Pseudo Champion)
Level 80-89 (Champion)
Level 90-99 (Master)
Level 100 (???)
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Move mastery
Basic, Intermediate, expert, mastery
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Pokeblocks:
Basic, Intermediate, Advanced
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Will add more things in future updates.