This is an OU team I made that I think is pretty decent.
I found that I would not only need a Pokemon that covers Lucario's weaknesses, but also a way to defeat some of it's counters. Gengar was an almost perfect fit.
After I added Gengar, I still needed a Pokemon that could resist Fire, so I chose Gastrodon as my third Pokemon, then I realized that both of my previous Pokemon actually resist Grass, Gastrodon's only weakness.
Now that both Gastrodon and Lucario's weaknesses were out of the way, I focused on Gengar's weaknesses. I also realized that I required a revenge killer. At first I used Hydreigon, but then I went down into the Underground and chose Krookodile for the job instead.
Seeing as how I had two Pokemon resistant to Dark and Ghost, I decided to choose Espeon so that I had a way to set up screens and utterly Cock-Block Will-O-Wisp and Toxic, two statuses that would probably give my team a lot of trouble.
As my team was nearing completion, I remembered that I had no Pokemon to set up hazards! So my last Pokemon was Forretress.
There you go!
_________________________________________________________________
In-Depth Analysis:
Courage (Lucario)
Ability: Justified
Item: Life Orb
252 Atk/252 Spd/4 HP
Nature: Adamant
Moves:
Swords Dance
Close Combat
ExtremeSpeed
Ice Punch
Lucario is one of the biggest beasts in Pokemon in my honest opinion. I mean it reminds me of the main characters of two of my favorite shows (Goku and Courage), not to mention that it's good movepool really makes it hard to predict. The reason I pack Ice Punch instead of Crunch is that Gengar can already handle everything that Crunch would hit.
BUSTED (Gengar)
Ability: Levitate
Item: Life Orb
252 Sp.A/252 Spd/4 HP
Nature: Modest
Moves:
Substitute
Shadow Ball
Thunderbolt
Focus Blast
Note: The reason I didn't want to use the SubDisable set is because I REALLY needed Thunderbolt to take on Skarmory.
Gengar is just awesome, it has a great offensive movepool, and it's immune to two of Lucario's weaknesses. It DESTROYS the two main Pokemon that would wall Lucario, Jellicent and Skarmory. It also serves as an excellent lure for Dark moves, which increases Lucario's attack thanks to Justified.
Lord Slug (Gastrodon)
Ability: Storm Drain
Item: Leftovers
84 Def/172 Sp.D/252 HP
Nature: Sassy
Moves:
Scald
Earthquake
Recover
Toxic
Honestly, I was never good at using Gastrodon. This is probably due to my own skill, but that's for a later discussion. Gastrodon sports two solid resistances and really good bulk, It has all the tools it needs to be a great special tank.
Krookaine (Krookodile)
Ability: Moxie
Item: Choice Scarf
252 Atk/252 Spd/4 HP
Nature: Adamant
Moves:
Earthquake
Crunch
Stone Edge
Superpower
Krookodile is probably my favorite Ground type of all time, It's a gangster crocodile! There isn't much that can top that sort of thing. Krookodile is a great revenge killer and potential sweeper thanks to it's amazing ability Moxie. I think I chose this over Hydreigon because Krookodile provided overall better coverage.
Mirror (Espeon)
Ability: Magic Bounce
Item: Light Clay
200 Def/56 Sp.D/4 HP
Nature: Bold
Moves:
Light Screen
Reflect
Psychic
HP Fire
Espeon is probably the definition of Cock-Block. It reflects Stealth Rocks, Spikes, Will-o-Wisps, Taunts, you name it! It's also a pretty awesome dual screen setter with this awesome niche. Espeon is also useful as a second lure for Dark type moves to increase Lucario's Attack. I ran Psychic over Psyshock because I need to hit Conkledurr as hard as I can with this.
Forfeit!! (Forretress)
Ability: Sturdy
Item: Leftovers
252 Def/4 Sp.D/252 HP
Nature: Bold
Moves:
Stealth Rock
Toxic Spikes
Spikes
Protect
I always liked Forretress, it's was a nice, reliable wall with probably the biggest array of entry hazards imaginable. I chose Protect because I really needed a way to scout. I didn't use the Custap Berry because this is my physical wall, not a suicide lead.
So there you have it folks! This is the end of my first RMT!
Sneak Peek:






Building Process:
One day, I decided to create a team based around Lucario, as I have never used it before and it sounded like a really good Pokemon. The first Pokemon I chose was obvious.

I found that I would not only need a Pokemon that covers Lucario's weaknesses, but also a way to defeat some of it's counters. Gengar was an almost perfect fit.


After I added Gengar, I still needed a Pokemon that could resist Fire, so I chose Gastrodon as my third Pokemon, then I realized that both of my previous Pokemon actually resist Grass, Gastrodon's only weakness.



Now that both Gastrodon and Lucario's weaknesses were out of the way, I focused on Gengar's weaknesses. I also realized that I required a revenge killer. At first I used Hydreigon, but then I went down into the Underground and chose Krookodile for the job instead.




Seeing as how I had two Pokemon resistant to Dark and Ghost, I decided to choose Espeon so that I had a way to set up screens and utterly Cock-Block Will-O-Wisp and Toxic, two statuses that would probably give my team a lot of trouble.





As my team was nearing completion, I remembered that I had no Pokemon to set up hazards! So my last Pokemon was Forretress.






There you go!
_________________________________________________________________
In-Depth Analysis:

Courage (Lucario)
Ability: Justified
Item: Life Orb
252 Atk/252 Spd/4 HP
Nature: Adamant
Moves:
Swords Dance
Close Combat
ExtremeSpeed
Ice Punch
Lucario is one of the biggest beasts in Pokemon in my honest opinion. I mean it reminds me of the main characters of two of my favorite shows (Goku and Courage), not to mention that it's good movepool really makes it hard to predict. The reason I pack Ice Punch instead of Crunch is that Gengar can already handle everything that Crunch would hit.

BUSTED (Gengar)
Ability: Levitate
Item: Life Orb
252 Sp.A/252 Spd/4 HP
Nature: Modest
Moves:
Substitute
Shadow Ball
Thunderbolt
Focus Blast
Note: The reason I didn't want to use the SubDisable set is because I REALLY needed Thunderbolt to take on Skarmory.
Gengar is just awesome, it has a great offensive movepool, and it's immune to two of Lucario's weaknesses. It DESTROYS the two main Pokemon that would wall Lucario, Jellicent and Skarmory. It also serves as an excellent lure for Dark moves, which increases Lucario's attack thanks to Justified.

Lord Slug (Gastrodon)
Ability: Storm Drain
Item: Leftovers
84 Def/172 Sp.D/252 HP
Nature: Sassy
Moves:
Scald
Earthquake
Recover
Toxic
Honestly, I was never good at using Gastrodon. This is probably due to my own skill, but that's for a later discussion. Gastrodon sports two solid resistances and really good bulk, It has all the tools it needs to be a great special tank.

Krookaine (Krookodile)
Ability: Moxie
Item: Choice Scarf
252 Atk/252 Spd/4 HP
Nature: Adamant
Moves:
Earthquake
Crunch
Stone Edge
Superpower
Krookodile is probably my favorite Ground type of all time, It's a gangster crocodile! There isn't much that can top that sort of thing. Krookodile is a great revenge killer and potential sweeper thanks to it's amazing ability Moxie. I think I chose this over Hydreigon because Krookodile provided overall better coverage.

Mirror (Espeon)
Ability: Magic Bounce
Item: Light Clay
200 Def/56 Sp.D/4 HP
Nature: Bold
Moves:
Light Screen
Reflect
Psychic
HP Fire
Espeon is probably the definition of Cock-Block. It reflects Stealth Rocks, Spikes, Will-o-Wisps, Taunts, you name it! It's also a pretty awesome dual screen setter with this awesome niche. Espeon is also useful as a second lure for Dark type moves to increase Lucario's Attack. I ran Psychic over Psyshock because I need to hit Conkledurr as hard as I can with this.
Forfeit!! (Forretress)
Ability: Sturdy
Item: Leftovers
252 Def/4 Sp.D/252 HP
Nature: Bold
Moves:
Stealth Rock
Toxic Spikes
Spikes
Protect
I always liked Forretress, it's was a nice, reliable wall with probably the biggest array of entry hazards imaginable. I chose Protect because I really needed a way to scout. I didn't use the Custap Berry because this is my physical wall, not a suicide lead.
So there you have it folks! This is the end of my first RMT!