to bring hatchlings up to the level of the area’s level cap. This keeps the pace fast and focuses the gameplay on strategy rather than mindless hatching cycles. Team Synergy:

If you hatch a Pokémon species you already own (alive or dead), you may re-roll that egg once. This prevents a team of six Zigzagoons.

A modern take that removes all wild encounters and focuses strictly on Gym Battles and the Elite Four for a 2-hour "boss rush" experience. Draftlockes: