"Standard NatDex" is very weird compared to how OMs usually work.
See "TierShift Mod" and "Godly Gift Mod". NatDex now gets its own mod,
which can be mixed into any other format, instead of needing to start
with NatDex.
This would make Min Source Gen overriding annoying, so it now defaults
to the current gen in Gen 9+, if Obtainable is set and +Past isn't. So
now you don't need to manually set Min Source Gen to enforce Obtainable
in Gen 9.
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