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How to unlock all eggs
False Swipe, Swablu Given to you at the start of the game.
Extremespeed, Zigzagoon Given to you when you store 60 Pokemon.
Pay Day, Skitty Given to you when you store 500 Pokemon.
Surf, Pichu Given to you when you store 1499 Pokemon.
Completion bonus
Successfully collect all Pokemon in either Pokemon Ruby or Pokemon
Sapphire to unlock an alternate border in adventure mode.
Swablu with False Swipe Egg:
Store 1 Pokemon.
Zigzagoon with Extreme Speed Egg:
Store 60 Pokemon.
Skitty with Pay Day Egg:
Store 500 Pokemon.
Pichu with Surf Egg:
Store 1499 Pokemon.