Struggling with Reukra. Any Improvements

(Bonezard) Delta Charizard: Holding Delta Charizardite LV: 91
-Lunar Cannon
-Shadow Sneak
-Fly
-Dragon Pulse

(FreezerZap) Delta Gardevoir: Holding Choice Specs LV: 90
-Thunderbolt
-Sheer Cold
-Ice Beam
-Calm Mind (Only use when choice specs isnt on)

(Gateau) Delta Crustle: Holding White Herb LV: 88
-Shell Smash
-Chip Away
-Play Rough
-Metal Claw

(Its a trap) Ferrothorn: Holding Focus Band LV: 90
-Iron Head
-Power Whip
-Swords Dance
-Payback

(Sealight) Delta Lilligant: Holding Shell Bell LV: 93
-Firey Dance
-Scald
-Acid Armor
-Will-O-Wisp

(Voidwalker) Mew: Holding Pixie Plate LV: 90
-Focus Blast
-Dazzling Gleam
-Nasty Plot
-Psychic

Any improvements would be appreciated. I am planning on replacing Delta Charizard with Mega Spiritomb or Mega Hydregion, but i havent got their mega stones yet.