Rate my Ruby Team Please

Just restarted my Ruby after a long break from it, I like my team and its got some favs but I dont know if its strong enough

Lvl 32. Marshop
Move 1:Ice Beam
Move 2:Mudshot
Move 3:Surf
Move 4: Take Down

Lvl 30. Swalot
Move 1:Shockwave
Move 2:Sludge
Move 3:Yawn
Move 4:Body Slam

Lvl 30. Magneton
Move 1:Thunderbolt
Move 2:Sonicboom
Move 3:Supersonic
Move 4:Thunderwave

Lvl 31. Mightyena
Move 1:Shadow Ball
Move 2:Swagger
Move 3:Rock Smash
Move 4:Bite

Lvl 30. Skarmory
Move 1:Fly
Move 2:Steel Wing
Move 3:Swift
Move 4:Fury Attack

Lvl 29. Breloom
Move 1:Counter
Move 2:Mach Punch
Move 3:Headbutt
Move 4:Leech Seed

I've beaten 6 of the Gyms so far with relative ease, and destroyed my Rivals team. If I should replace any please tell me with what thanks