Can't be bothered to list improvements fully so I'll just change what needs changing in bold.
Land Bird (Gliscor) @ Toxic Orb
Ability: Poison Heal
Shiny: Yes
EVs: 184 HP / 252 SpD / 72 Spe
Careful Nature
- Swords Dance
- Earthquake
- Stone Edge/KnockOff
- Roost
talonflame is banned. see bottom for ideas on new mons
Thunder God Bird (Thundurus-Therian) @ Life Orb
Ability: Volt Absorb
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 1 Atk
- Focus Blast
- Hidden Power Ice
- Thunderbolt
- Psychic
just saying pokemon showdown will cut that name off
togekiss isn't too good in mono flying - it doesn't add anything useful
thundurus is better than zapdos and you already have an electric
Metal Bird (Skarmory) @ Leftovers
Ability: Sturdy
EVs: 232 HP / 252 SpD / 24 Spe
Careful Nature
- Brave Bird
- Stealth Rock
- Roost
- Defog
Okey now for new mons:
Mantine for ice counter. Also walls scizor
Scald, Roost, Defog, Toxic/AirSlash
Invenst in Defense.
Mega Charizard instead of talonflame
FireBlast, Focus Blast, Solar Beam, Air Slash**
Mega Aerodactyl
Excellent wallbreaker. Use Adamant, its fast enough
StoneEdge, Earthquake, Aerial Ace, FireFang/HoneClaws/AquaTail
Dragonite/Salamence/Gyarados
Dragon Dance
ElectiumZ Thunder Punch on dragonite/Fire Fang on Salamence/Waterfall Gyarados
Dragon Claw for dragons/Bounce with Flyingium Z on gyarados.
Sub on gyarados. Earthquake on dragons.
hope this helps