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I would suggest you to replace gyro ball and rum thunderwave on Ferrothorn, to cripple things like Latios, Greninja ,which can even run a scarf and Zard at +1 speed can not outspeed them.
Why expert belt on Magerana you have your Z-Move slot open so you can let it hold a Z-Crystal .
Run nature madness on Fini. Scald is not good if you are aiming for a burn chance id you just want a damaging water STAB then go for Surf/Hydro Pump/Muddy Water.
And as Shadow said run HP Ice on...
Now iam trying to make a Mega Zard Y team but having some trouble with the team.So the team is
1. Charizard
Charizard-Mega-Y (M) @ Charizardite Y
Ability: Drought
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Fire Blast
- Solar Beam
- Roost
- Focus Blast
Pretty...
Scald on Fini is not good as it's Terrain can burn a grounded opponent , yiu can switch it with Nature Madness or Surf/Muddy water if you want a Water STAB.