Need advice fine tuning team for e4

Team as follows, looking for optimal items or any changes to get me through post game

Delta venusaur @ D. Venusaurite
Modest 252 Hp / 252 SpA
Moonblast
Psychic
Calm mind
Moonlight

Delta haxorus @ wide lens
Adamant 252 Atk /252 Spe
Aqua tail
Ice fang
Crunch
Iron head

Chandelure @ charcoal
Timid 252 SpA /252 Spe
Calm mind
Flamethrower
Shadow ball
Energy ball

D. Gardevoir @ never-melt ice
Timid 252 SpA /252 Spe
Thunderbolt
Ice Beam
Moonblast
Calm mind

D. Snorlax @ Leftovers
Adamant 252 Hp /252 Atk
Wood hammer
Drain punch
Earthquake
Synthesis

D. Hydreigon @ soft sand
Timid 252 SpA /252 Spe
Hyper voice
Corrode
Earth power
Flamethrower