Question: Why are starters Gen 0, and what does Gen 0 mean?

Answer:
A starter is an original egg that serves as the foundation for breeding. Whether it’s a Classic Starter or a Limited Edition Starter (LE Starter), it is always classified as Gen 0.

You cannot breed a Gen 0 starter with other generations (Gen 1, 2, 3, etc.). This is because Gen 0 is not a regular generation, but rather the original egg that allows you to begin breeding in the game.

Please note that Limited Edition Starters (LE Starters) are different from Limited Edition non-starter butterflies. Only LE Starters are Gen 0 and locked to breed only with other Gen 0 starters.