Help with a Pokemon team

Herroww there. I'm in need of some help for a team. I'm using it for both competitive battling, and beating the game. I can get pretty much any Pokemon from any game up to Emerald. Keep in mind, I'm just a rookie at competitive battling. I enjoy constructive criticism so without further ado, my team.

Scizor
Leftovers
Swarm
108 HP, 252 ATK, 148 SPE
Adamant

Swords Dance
Silver Wind
Hidden Power Rock
Agility
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Sceptile
Leftovers
Overgrow
4 DEF, 252 Sp. A, 252 SPE
Timid

Substitute
Leech Seed
Leaf Blade
Hidden Power Fire/Ice

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Salamence

Leftovers
Intimidate
252 ATK, 4 SpA, 252 SPE
Adamant

Dragon Dance
Hidden Power Flying
Earthquake
Fire Blast
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Milotic

Life Orb
Marvel Scale
252 HP, 252 DEF, 4 SpA
Modest

Surf
Ice Beam
Hidden Power Grass/Electric
Recover
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Jolteon

Leftovers
Volt Absorb
252 SpA, 4 SpD, 252 SpE
Timid

Subsitute
Thunderbolt
Hidden Power Ice
Baton Pass

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Steelix

Leftovers
Sturdy
252 HP, 4 ATK, 252 SpD
Impish


Earthquake
Rest
Roar
Toxic

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I had a bit of trouble using Scizor, so it would be fine replacing that. I also had a bit of trouble using Jolteon. I think I need more walls in my team, but that's why I posted here. I'm probably going to replace Scizor, and Jolteon. I was thinking I needed walls. I don't like legendaries on my team, so please don't suggest that.

Thank you in advance!

~Raven