>>33135138Being good isn't linear. And usage doesn't always show which Pokemon is better.
In Landorus-T's case, it fit nearly everywhere and is pretty diverse.
But with Landorus-I, it's only good switch in is Mega Latias, which isn't even released. And unlike Landorus-T, it doesn't require Z-moves and 20 different sets to have "no counters". All it just needs is life orb, and a bunch of select moves to choose from. Landorus-I is so strong as a special attacker that it can 2HKO chansey after a knock-off with non-STAB special moves.
252 SpA Life Orb Sheer Force Landorus Focus Blast vs. 248 HP / 8 SpD Chansey: 385-455 (54.7 - 64.7%) -- guaranteed 2HKO
When you can 2HKO a Chansey with attacks that hit its special defense, it says a lot.