Pokémon Tretta League Opening! (Tretta)
Template:TrettaExpansionInfobox
Pokémon Tretta League Opening! (Japanese: ポケモントレッタリーグ開幕！) is the first core Pokémon Tretta set. It features 48 Tretta.
Set list
| Tretta No. | Name | Type | Class |
|---|---|---|---|
| 1-01 | Keldeo | 
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| 1-02 | Kyurem | 
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| 1-03 | Meloetta | 
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| 1-04 | Meloetta |
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| 1-05 | Cobalion | 
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| 1-06 | Terrakion | 
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| 1-07 | Virizion | 
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| 1-08 | Servine |
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| 1-09 | Pignite | 
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| 1-10 | Dewott | 
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| 1-11 | Pikachu | 
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| 1-12 | Lucario |
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| 1-13 | Keldeo |
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| 1-14 | Kyurem |
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| 1-15 | Meloetta |
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| 1-16 | Meloetta |
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| 1-17 | Pikachu |
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| 1-18 | Servine |
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| 1-19 | Pignite |
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| 1-20 | Dewott |
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| 1-21 | Snivy |
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| 1-22 | Tepig |
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| 1-23 | Oshawott |
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| 1-24 | Axew | 
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| 1-25 | Munna |
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| 1-26 | Sandile | 
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| 1-27 | Psyduck |
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| 1-28 | Sudowoodo |
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| 1-29 | Scraggy | 
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| 1-30 | Meloetta |
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| 1-31 | Meloetta |
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| 1-32 | Pikachu |
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| 1-33 | Lucario |
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| 1-34 | Cobalion |
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| 1-35 | Terrakion |
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| 1-36 | Virizion |
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| 1-37 | Servine |
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| 1-38 | Pignite |
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| 1-39 | Dewott |
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| 1-40 | Snivy |
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| 1-41 | Tepig |
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| 1-42 | Oshawott |
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| 1-43 | Axew |
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| 1-44 | Munna |
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| 1-45 | Sandile |
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| 1-46 | Psyduck |
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| 1-47 | Sudowoodo |
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| 1-48 | Scraggy |
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