It seems no one has post a fully stall set for this. I would like to post this:
BulkySubSeeder@Leftover
252HP/40Def/216SpD Impish ( Physical Defensive)
252HP/4Def/252SpD Careful ( Special Defensive)
Substitute
Leech Seed
Spikes
Protect
Ferrothorn looks like a very bad seeder at first glance...