Bollterus

Diamond +2: Any frontal attack is repulsed. It is a docile Pokémon that feeds on grass and berries.

Pearl: When attacked, they form a wall with their shieldlike faces to protect their young.

Platinum +6: When they lined up side by side, no foe could break through. They shielded their young in that way.

HeartGold / SoulSilver: When attacked, they form a wall. Their rock-hard faces serve to protect them from the attacks.

Sun: While it can guard against any sort of attack from the front, it is left without recourse when attacked from behind.

Moon: It lived in the same environments as Rampardos. Their fossils have been found together— seemingly from after they’d fought to the finish.

Ultra Sun: The bones of its face are huge and hard, so they were mistaken for its spine until after this Pokémon was successfully restored.

Ultra Moon: This Pokémon is from roughly 100 million years ago. Its terrifyingly tough face is harder than steel.

Legends: Arceus: Its face is sturdy—as strong as diamond—and this hardness offers a very stable defense. Much about this species is still unknown, such as its natural habitat.