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There is literally no reason to not use Landorus. It does something against every team and has NO counter. So you thought that your Chesnaught could come in and spike up on the Landorus? Supersonic skystrike kills you through spiky shield. Same thing with Tangrowth. Oh, you're using defensive Zapdos to deal with it? Get crushed motherfucker. Using offense? Enjoy every single offensive attacker lacking an ice move being forced out while giving your opponent momentum thanks to u-turn or rocks.
It's absolutely the perfect, flawless Pokemon. Literally always does something, is literally always useful unless it's being killed by a random ice move by a lure.