The only way you skip the credits is to set it on the floor and skip over it.
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Turn the game off then on.
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.
turn the game offf...
Press ESC
well i personally don't know but if it is like the other games and saves after you defeated the elite four then you could turn of the computer and restart it