The first time I beat Emerald it was a KotR/HP Absorb/Mime deal. Then I learned about the glorious game mechanic that is Lucky 7s.

For those of you who don't know if a character's HP becomes 7777 and Easter Egg activates that causes them spontaneously launch an attack with 63 hits that all do 7777 damage. That is 490,000 damage. Exploiting this the beat the weapons is a mighty fine feeling.