Sledge Bro

Sledge Bros., or Elite Hammer Bros. (often incorrectly referred to as a Sumo Bro.) are large overweight versions of Hammer Bros. that throw sledge hammers instead of regular ones.

Super Mario Bros. 3
The Sledge Bros. first appeared in Super Mario Bros. 3, where they replace Hammer Bros. in Big Island's levels, as well as on the area's map. If a Sledge Bro. sees Mario or Luigi, it attacks them by throwing sledge hammers at them; additionally, whenever a Sledge Bro. jumps and lands on the ground, it creates a miniature earthquake which can paralyze Mario. To defeat a Sledge Bro., Mario can either jump on it, hit it with a Shell, use a fireball as Fire Mario, or a hammer as Hammer Mario to take it out.

Originally, their map icon was a Hammer Bro., but in the SNES remake in Super Mario All-Stars, their map icon changed into a green Hammer Bro.. Their map icon was later changed to properly resemble a Sledge Bro. in Super Mario Advance 4: Super Mario Bros. 3.

New Super Mario Bros.
Sledge Bros. reappear in the eighth world of New Super Mario Bros. The Sledge Bros. of New Super Mario Bros. can be defeated by jumping on them, hitting them with a fireball as Fire Mario or by touching them when Mario is empowered by a Starman. Like the Fire Bros., they only appear in World 8-7. Unlike in Super Mario Bros. 3, their jump no longer causes earthquakes. Instead, they have a special ground pound that does cause earthquakes and can also break through stone blocks. This is needed to obtain a Star Coin.

In this game, Sledge Bros. are misnamed Sumo Bros., a name previously associated with an unrelated enemy from Super Mario World.

New Super Mario Bros. Wii
Sledge Bros. reappear in the game New Super Mario Bros. Wii as rare enemies, along with Hammer Bros. They are first encountered in World 6, where a pair of Sledge Bros. guard the exit of the cave in the world's second level. They also appear in World 7 in Ludwig's castle. Like in New Super Mario Bros., their jump and ground pound moves are separate, although they are no longer seen breaking stone blocks. The official strategy guide still misnames them Sumo Bros..

Sledge Bros., along with the Fire Bros. again, outnumbered the once common Hammer Bros. in this game, the former being in two levels while the latter only appear in one.

New Super Mario Bros. 2
Sledge Bros. reappear in New Super Mario Bros. 2, acting just like they did in past games. However, only one exists in the main game, appearing in World 2-2. They also appear as common enemies in the third course of the Coin Challenge Pack A in Coin Rush. Several later appear in the first course for the Mystery Adventures Pack. While the effects of a Gold Ring are active, Sledge Bros. are unaffected physically, but still give coins when defeated.

Sledge Bros. are once again mistakenly referred to as Sumo Bros. in this game for unknown reasons.

New Super Mario Bros. U
Sledge Bros. make a return in New Super Mario Bros. U, appearing only in the level, Ludwig's Clockwork Castle, which is found at Meringue Clouds. Only three are seen in the game, and unlike in the previous installments, where the Sledge Bros. are erroneously referred to as Sumo Bros., they're called by their correct name in this game.

The Adventures of Super Mario Bros. 3
Sledge Bros. make several appearances in The Adventures of Super Mario Bros. 3, where they are among the elite of King Koopa and the Koopalings' military forces. They are generally portayed as fairly tough soldiers, and manage to pose as major enemies to Mario, Luigi, Princess Toadstool and Toad in many episodes. Much like in the game, Sledge Bros. are able to cause tremors by jumping.

Nintendo Adventure Books
A team is six Sledge Bros., called the Hammers, appear as competitors in the International Mushroom Games in Leaping Lizards. The only one of them to have his named mentioned, Angus Boomer, appears to be their leader. They compete in all the events except the Super Triple Jump, since their stubby legs are only good for leaping vertically, not horizontally.

A pair of Sledge Bros. appear in Koopa Capers as members of Wendy O. Koopa's secret rebellion. When Luigi discovers the rebellion's camp in the Magma Pits, Wendy orders the Sledge Bros. to throw him into a boiling pool of water, but if Luigi whistles the correct tune, he makes them drowsy, and tricks one into leaving by asking for a pencil to leave a note for Mario as his last request. Luigi distracts the remaining Sledge Bro. by pointing out how poorly a group of Koopa Troopas are doing a marching formation, and defeats him and his returning brother by knocking out some of the Koopa Troopas and kicking their shells at the two burly soldiers.

Yoshi's Safari
In Yoshi's Safari, Sledge Bros. appear as mini-bosses who attack Mario and Yoshi by throwing sledge hammers at them; a Sledge Bro. can also immobilize Mario and Yoshi by stomping the ground. A Sledge Bro. must be hit multiple times with Mario's Super Scope to defeat it in Yoshi's Safari. To avoid being hit, Mario can shoot the sledge hammers that the Sledge Bro. throws, destroying them.

Mario Kart Wii
In Mario Kart Wii, some Sledge Bros. can briefly be seen in some sections of the Daisy Circuit and on a ship in D.K.'s Jungle Parkway, along with other spectators.

Trivia

 * In their original artwork for Super Mario Bros. 3, a Sledge Bro. has snot displayed flowing out of its nose. The in-game sprites also show this, though it is hardly visible. Their Super Mario Advance 4 sprites keep this as well, though the snot characteristic wasn't reused for the Sledge Bro. again.
 * An ordinary Hammer Bro. in Mario & Luigi: Superstar Saga resembles a Sledge Bro.