A family is not a roster
Reference data connects forms into families, such as Gastly → Haunter → Gengar. The League roster separately identifies starting entries. An evolved form in the reference data does not prove it has a standalone League unlock.
That is why the Gengar page points back to Gastly rather than inventing its own capture challenge.
The game has its own level logic
The client plans evolution during a run. A League entry can provide a special level or sequence of levels, which takes priority over the generic conversion.
Do not substitute familiar main-series levels, trading requirements or stone requirements when this preview has not verified the PokéBonk rule. Check the original game’s current evolution display.
Eevee is a configured branch
The reviewed League configuration gives Eevee a branch level of 36 and lists Vaporeon, Jolteon and Flareon as candidates. This supports a configuration note, not a claim that the selection interaction has been playtested.
Evolution progress during a run and acquiring the base League partner are separate tasks. Keep them separate when deciding your next step.