OK, here's the first draft for my team:
Scyther (♂) @ Leftovers
Ability: Swarm
EVs: 252 HP/100 Def/158 SDef
Impish nature (+Def, -SAtk)
- Swords Dance
- Agility
- Quick Attack/X-Scizzor
- Baton Pass
SD and Agilipasser. Self-explanatory.
I'd use X-Scissor over Quick Attack, in case of Ghosts.
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Buneary (♀) @ Iron Plate
Ability: Klutz
EVs: 4 HP/252 Atk/252 Spd
Lonely nature (+Atk, -Def)
- Return
- Ice Punch
- Jump Kick
- Switcheroo
This one's quite novel. She already has decent speed, but I'm going to use Klutz/Switcheroo to actually make use of the ability. Return for STAB, Ice Punch and Switcheroo for coverage.
I think you mean Iron Ball, not Iron Plate. The Iron Plate makes the holder's Steel attacks do 20% more damage, while the Iron Ball makes the Pokémon slower (cuts Speed in half?) and negates any Ground immunity the holder may have due to being Flying type or having Levitate. The Iron Ball also has the highest base power when used with Fling. Other than that, I'd recommend an Adamant Nature over a Lonely one, because Gabite can still own you with Bite.
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Pichu (♂) @ Focus Sash
Ability: Static
EVs: 4 HP/252 Spd/252 SAtk
Timid nature (+Spd, -Atk)
- Nasty Plot
- Thunderbolt
- Grass Knot
- Hidden Power [Ice]
Special sweeper. As a big fan of the Pikachu line, I'll be sure to make use of this. Sash so I can be sure to get a NP in. I'll try and breed for HP Ice, but nothing is guranteed, as there doesn't seem to be another Special Attack he can use, except maybe Swift from Emerald.
This is both good and straightforward. Just watch out for Taunt.
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Turtwig (♂) @ Leftovers
Ability: Overgrow
EVs: 252 HP/52 Atk/200 Def
Impish nature (+Def, -SAtk)
- Curse
- Seed Bomb
- Synthesis
- Stealth Rock/Bite
Tank. Curse up, Synthesis for recovery, attack with Seed Bomb. Stealth Rock for team support, or could switch with Bite. It's the best I can do before Lv. 25.
I'd pick Bite here, because having only one attack doesn't look good to me. You can use Stealth Rock just fine, it's just that I don't really see it as useful in this situation.
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Pineco (♂) @ Leftovers
Ability: Sturdy
EVs: 252 HP/4 Atk/252 Def
Relaxed nature (+Def, -Spd)
- Spikes
- Rapid Spin
- Earthquake/Gyro Ball
- Explosion
Physical Wall. Used in the same way as Forry in Standard.
Gyro Ball looks better here, especially if you use an Iron Ball here (I know you won't).
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Tentacool (♂) @ Chesto Berry
Ability: Clear Body
EVs: 252 HP/4 SAtk/252 SDef
Calm nature (+SDef, -Atk)
- Confuse Ray
- Rest
- Swords Dance
- Waterfall
Special Wall. Thinking about replacing him though: No team support and no reliable recovery move. So the best I can do is Confuse Ray, SD up, then rest before mini-sweeping with Waterfall
Using Rest without Sleep Talk is still dangerous, even though this isn't your usual battle. It means your opponent gets a free turn while you switch, or two free turns while you wait for Tentacool to wake up. There's also Bug Bite and Pluck to worry about, so I'd use Natural Gift over Rest here, and a different Berry if you don't keep Rest.
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So yeah, that's the provisional. Let me know what you think.