Ancient Swimmer
Armaldo@Muscle Band/Life Orb
Adamant nature
Swift Swim
252 Atk/252 Spd/4 HP
~Stone Edge/Rock Slide
~X-Scissor
~Earthquake
~Brick Break/Low Kick
Swift Swim is exactly what Armaldo needed. If you can fit this set onto your Drizzle team, you can sweep to hell and back. Armaldo has an incredible Attack stat, and a woefully sub-par Speed stat, which Swift Swim rectifies easily. Stone Edge is the STAB move of choice, but if the accuracy is a turn-off, Rock Slide is an acceptable alternative. X-Scissor is also for STAB. Earthquake for additional coverage, same with the last move. Brick Break is more, shall we say, consistent with the damage output, but Low Kick can potentially prove to be more powerful against certain targets.
Item boosts Armaldo's Attack. Ability should be obvious (bear in mind it is illegal to use Swift Swim and Drizzle on the same team for those of you who play by Smogon's rules).
Fossil Polish
Armaldo@Muscle Band/Life Orb
Adamant nature
Battle Armor/Swift Swim
252 Atk/252 Spd/4 HP
~Rock Polish
~Stone Edge/Rock Slide
~Earthquake
~X-Scissor/Brick Break/Low Kick
A twist on the previous set, which allows Rock Polish instead to do its work on Armaldo's Speed. Riskier, but legal by Smogon standards and usable off a Rain team. The last slot doesn't matter too much, not with EdgeQuake covering lots of stuff on its own.
Item is for boosting Armaldo's already nice Attack. Ability doesn't actually matter.
Other options:
*Armaldo has access to Swords Dance, but its Speed is what needs the help. If it could have more than four moves, maybe, but the best you can hope for is to squeeze it in somewhere in the Swift Swim set.
*Aqua Tail is a viable option, especially on the Swift Swim set, as the Rain will be powering it up.
*Hone Claws can fix the accuracy problem with Stone Edge, but it suffers the same issues as Swords Dance.
Abilities:
*Battle Armor: Moves used against Armaldo cannot score critical hits. A decent ability in its own right, and coupled with Armaldo's decent bulk, it could possibly make all the difference should something manage to survive one of its moves and strike back.
*Swift Swim: Armaldo's Hidden Ability, and a true Arceussend. Doubles Armaldo's Speed in rain. Works like its Rock Polish, but without the need to waste a turn or a moveslot for the setup.
Partners:
The Swift Swim set obviously wants Politoad in its corner. As always, you can't go wrong with Smashpassing, and Tailwind users can also be a great help.
Counters:
Skarmory can take anything Armaldo can dish out and does a number on it in return with Drill Peck or Brave Bird. Physical walls in general, you should look out for. Weezing in particular takes Armaldo's attacks like the boss it is and can cripple it with Will-O-Wisp.
Opinion:
An underrated powerhouse, and cool-looking to boot, Armaldo is just awesome.
Prediction for next week:
Coming soon...