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I knew someone on a Pokemon forum back in the day who went through the ENTIRE Pomeg glitch in Emerald to hatch a level 5 Gardevoir.
(Pomeg Glitch: Have an egg and a poke with lots of HP EVs in party with 1 HP. Use Pomeg berry on pokemon, it glitches down below 0 HP left, use potion to bring it "up" to 0 HP. Game won't check for fainting pokemon so you can now send your egg into battle. It gains EXP and can level up/evolve but it faints after every battle. It also hatches at level 5 even if it evolved.)
Pic related: example of color swapped Pomeg glitch sprite. I WISH I could find a pic of Ralts line with the Pomeg color palette swap.