Lin's can be both tho
For Zekrom, either you fight Taka at WTC [normal Zekrom], or don't fight then don't let him go with you [Hell Zekrom, a.k.a Taka bye bye forever] to achieve it
Meanwhile Reshiram, it's like you're following Anna route but fail at any of 9 important requirements [which immediately revert you back to Zekrom]