I would replace Choice Band with Life Orb on Mamoswine. You really don't want your opponent having a free turn to set up when you're locked into an earthquake, or a weak ice shard.
Additionally, Ferrothorn seems to magnify your weaknesses to a lot of potential threats. I would replace it with Starmie to better handle rain teams. Starmie allows you to rapin spin efficiently, not worry about toxic spikes at all (thanks to natural cure and venusaur), and you will definitely have more opportunities to spin due to Starmie's high speed, and access to recover. You do lose out on the hazards helping your Mamo/Mence lose out on KO's, but it gives you a much better matchup against common teams. And Starmie is capable of weakening those pokemon enough to where spikes/tspikes hazards would not have mattered (although thats wishful thinking).
Starmie @ Leftovers
Trait: Natural Cure
EVs: 236 HP / 72 SAtk / 200 Spd
- Rapid Spin
Scald on a sun team is unorthodox, but there will definitely be occasions where you want to get the burn on something, or when you don't have the sun up.
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