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Lv. 100? You're a bit too late if you haven't EV trained it already. You should never train your Pokemon to Lv. 100 until you're sure they are all set and ready to go.
Aggron @Choice Band
EVs: 252 HP / 252 Atk / 6 Def
Adamant Nature
-Stone Edge
-Earthquake/Focus Punch
-Iron Head
-Avalanche
Stone Edge and Earthquake cover the majority of opponents. Focus Punch can be used over it if you happen to be good at prediction. Iron Head for a second STAB and Avalanche to hit Ground types.
Aggron @Leftovers
EVs: 252 HP / 252 Atk / 6 Def
Impish Nature
-Stone Edge/Rock Slide
-Focus Punch
-Substitute
-Thunder Wave
Paralyze your opponents with T-Wave and set up a Sub (you can also do it the other way around). Your opponent's Speed will be hampered and you can attack with Focus Punch or a Rock attack.
Aggron @Leftovers/Focus Sash
EVs: 252 HP / 252 Atk / 6 Def
Brave/Relaxed Nature
-Metal Burst
-Taunt/Protect
-Stone Edge
-Earthquake/Focus Punch
Aggron is one of only two Pokemon to learn Metal Burst (the other being Bastiodon). Use Protect to scout for your opponent's moves or Taunt to force them to use only offensive attacks. Then use
Metal Burst to retaliate.
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