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Magikarp isnt Charizard

Like most big green spells of its kind, it exiles itself as part of the spells resolution

Even though the ideal switching method is Keldeo-EX plus Float Stone, sometimes your Float Stone get discarded or you can't attach one due to Item-lock (which isn't too uncommon in Expanded with Seismitoad-EX and Trevenant being popular decks), so Darkrai-EX gives you a much easier time switching between Pokemon

This is what led it, for instance, to get the Bloodstone Ritual (a la Dark Ritual) that black used to have

Now it no longer has the highest ATK on the field and Pole Position now affects Blue-Eyes White Dragon instead