Ludicolo has to be one of the most interesting Pokemon gen 3 released to us back in the days of Ruby and Sapphire. A mariachi, lily pad, duck...that also has dual typing that matches two starter types! That typing is great offensively and defensively, not to mention it has a very wide movepool that allows you to run physical and special attacking sets. Top it off with Swift Swim as an ability and Ludicolo becomes hard to pass up on your team while playing your gen 3 game of choice. Sadly, Ludicolo isn't really able to function as well as I hyped it up, namely due to low it's base stats are, 4 all of which sit at an even 70, with 90 and 100 go to special attack and defense. That should not stop you from having fun using Ludicolo though. Miror B has four of them, and he's enjoying life to the fullest!
Miror B used Rain Dance!
Ability: Swift Swim
Item: Life Orb
Nature: Timid/Modest
EVs: (HP 4) (Sp.Attack 252) (Speed 252)
Moves:
Rain Dance/Focus Blast
Hydro Pump
Giga Drain/Energy Ball
Ice Beam
Set Details:
A simple Rain Dance set that takes advantage of Swift Swim as your ability. Set up Rain Dance, or have your teammate do so for it for you (In which case sub out Rain Dance for Focus Blast to handle the likes of Ferrothorn), and then proceed to sweep with Hydro Pump. Your secondary Grass STAB will be used to handle Water types that resist Hydro Pump, and it is up to you which one you want to go with since Giga Drain offers recovery but Energy Ball has more power. Finally we have Ice Beam which takes out Grass and Dragon types that also resist your Hydro Pumps. Life Orb increases power output while your EVs and nature go into special attack and speed.
Sub-Seed Water Reed
Ability: Swift Swim
Item: Leftovers
Nature: Bold
EVs: (HP 252) (Defense 156) (Sp.Defense 100)
Moves:
Leech Seed
Substitute
Giga Drain
Scald/Ice Beam
Set Details:
Lay down Leech Seed and proceed to hide behind your Substitute while draining away your opponent's health. Giga Drain offers additional recovery with your STAB, while Scald offers secondary coverage with a high chance of burn allowing you to handles physical threats better. Ice Beam is still an option though since it handles other Grass types that are immune to Leech Seed and resist your dual STAB. Carry Leftovers this time to improve survivability and invest in your defensive stats.
Lily Pad Cad
Ability: Swift Swim
Item: Life Orb
Nature: Jolly
EVs: (HP 4) (Attack 252) (Speed 252)
Moves:
Sword Dance
Waterfall
Seed Bomb
Ice Punch/Fire Punch
Set Details:
A surprise physical sweeper set that employs Swords Dance to shore up your attack power. Waterfall becomes your main STAB this time and offers a nifty 30% flinch if you can move first (Rain support would be appreciated by your team so it can use Swift Swim). Seed Bomb is your secondary STAB, and the last move is a matter of what you prefer. Ice Punch handles the Grass and Dragon types like Ice Beam did before on the special attacking set, but Fire Punch is good deterrent against Ferrothorn and the Bug/Steels. Life Orb again will be used, while physical attack and primarily speed get your investment attention.