[RATE MY TEAM] Need suggestions for improvement

[thatoldpokemonman]

Ok so this is my team at the moment. It's is fairly successful when playing with it. My biggest issue is that I mainly start with Milotic and Mega Metagross. I don't have a problem with it because it works for me but in a 3 game series it might not. I just want some suggestions for improvement.


Milotic
Modest Nature
Ability: competitive
item: assault vest

icy wind
ice beam
dragon tail
hydro pump

252 HP/28Def/160SpA/64SpD/4Spe

M-Metagross
Jolly Nature
Ability: clear body
item: metagrossite

protect
substitute
iron head
zen headbutt

252Atk/252Spe/4HP

Garchomp
Jolly Nature
Ability: rough skin
item: rocky helmet

earthquake
dragon claw
rock slide
protect

252Atk/252Spe/4Def

Rotom-W
Bold Nature
Ability: Levitate
Item: chesto berry

Volt switch
hydro pump
will-o-wisp
Rest

252HP/252Def/4SpA

Chandelure
Timid Nature
Ability: Flash fire
item: choice scarf

fire blast
shadow ball
hidden Power dragon
energy ball

252SpA/252Spe/4Def

Serperior
Timid Nature
Ability: Contrary
Item: Focus Sash

leaf storm
dragon pulse
knock off
giga drain

252SpA/252Spe/4SpD

Any and all suggestions are welcome.