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I will tell you what types you need for each person in the elite four:
First: use fighting, if you have Blaziken then use him.
second: use Psychic and for one of them which is a dark type I would use Dragon or electric.
Third: use Fire for the ice types and electric for the seals.
Fourth: use ice or dragon type moves
Fifth: use fire to begin with then use a varying amount of fire and ice moves later on.