You can't skip the credits but you can speed them up by holding the B button however after your hall of fame is showed your game will save you can turn the game off and completely skip the credits that way.
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The only way you skip the credits is to set it on the floor and skip over it.
Turn the game off then on.
turn the game offf...
Press ESC
its not an emerald its RAYQUAZA the main legendary Pokemon in Pokemon emerald.