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Politoed would use Lefties, but I'd recommend Sitrus Berry for the sake of Item Clause.
Leech Seed is important for Ferrothorn; don't even bother with Ingrain, since it forces Ferrothorn to stay in battle, and that's not good since Fire and Fighting Pokémon can force it out easily.
Really, I don't see the point on Rapid Spin on Choice Scarf Starmie because it'll be locked in the move when it uses it, which can force it out. Use Expert Belt, since it has good supereffective coverage.
I'd rather not use Dragon Tail on offensive mixed Dragonite because the negative priority is annoying for something that doesn't invest in defenses at all:
EVs: 76 Atk/252 SAtk/180 Spe
Item: Life Orb
Dragonite should only use Dragon Tail on a defensive set:
EVs: 252 HP/4 SAtk/252 SDef
Get with the B2/W2 changes here; change Toxicroak's EV spread to 244 HP/132 Atk/120 Def/12 Spe to prevent any Terrakion variant that doesn't use Earthquake from 2HKOing it.
Same applies to Gastrodon; use the EV spread of 124 HP/252 SAtk/132 SDef. Recover should only be used with Life Orb; otherwise use Hidden Power (Grass)