Okay, I made a new Emerald Team, and I'd like some input:
Magneton- Lvl 55-
Timid Nature (+Spd, -Atk)
- Protect/Metal Sound (XD only)
- Thunder Wave
- Toxic
- Thunderbolt
Where do I begin? First of all, Magneton is a bad choice of a lead Poke. It has a bad nature. Neutral natures should be avoided at all costs. They are worthless. DO NOT replace Thunderbolt with the crappy Zap Cannon. TB is your only worthwhile move on Magneton. Also, never give a Poke two attacking moves of the same type. It is redundant and prevents the Poke from being more versatile. Protect is helpful and MS is only if you have XD. TW to para things, and Toxic is basically filler since in-game Maggie suffers a lot with its limited movepool.
Cacturne- Lvl 58- Jolly Nature
Leech Seed
Needle Arm
Cotton Spore
Solar Beam
I prefer Shiftry over Cacturne. It doesn't have as high base attacks (100/90 compared to 115/115), but its HP and Spd is higher.
Shiftry @ Leftovers
Modest Nature (+SAtk, -Atk)
- Explosion
- Shadow Ball/Brick Break
- Solarbeam
- Sunny Day
One of only a few good Sunnybeamers. SB/BB depends on your preference and Explosion kills stuff.
Metagross @ Choice Band- Lvl 52-
Adamant Nature (+Atk, -SAtk)
- Earthquake
- Explosion
- Rock Slide/Agility
- Meteor Mash
Metagross excels as a physical sweeper. Psychic is useless since MM can do just as much damage. Agility to make Metagross even more deadly and go BOOM when its HP is low.
Crobat @ Choice Band- Lvl 59-
Adamant Nature (+Atk, -SAtk)
- Sludge Bomb
- Return/Steel Wing
- Wing Attack
- Shadow Ball
Giga Drain? Why not a STAB physical move like Sludge Bomb? Return/SW is your preference. I normally never suggest Normal moves on non-Normal Pokes, but with CB, Return hits hard. Not really necessary with both Metagross and Salamence though.
Swampert- Lvl 67-
Brave Nature (+Atk, -Spd)
- Ice Beam
- Surf
- Earthquake
- Protect/Rest
This set depends on what role you want Swampert to play. Since you already have Metagross and Salamence, a mixed sweeper would work.
Salamence- Lvl 59-
Jolly Nature (+Spd, -SAtk)
- Aerial Ace
- Dragon Dance
- Earthquake
- Fire Blast/Rock Slide/Brick Break
Never give any TM (not called Surf) to member of your team. They are too crappy to even use. DDmence is a terror. The moveset should be self-explanatory.