Ferroseed

A good defensive typing and above average bulk when holding Eviolite give Ferroseed a small niche as a check to prominent threats such as Primarina, Latias, Grassium Z Celebi, and Mega Altaria as well as a setter of Stealth Rock or Spikes. Additionally, Iron Barbs is a good situational ability, giving Ferroseed the ability to punish certain physical attackers such as Mimikyu and spinners like Starmie. Moreover, Ferroseed can use its ability along with moves like Leech Seed and Toxic to reliably rack up chip damage on opposing teams. However, Ferroseed's reliance on Eviolite means the omnipresent Knock Off and the less common Trick from Pokemon like Bisharp and Togekiss must always be accounted for. Ferroseed additionally has a subpar matchup against common entry hazard removers like Rotom-H and Gligar, and its weaknesses to Fighting- and Fire-type moves leave it forced out by common threats like Moltres and Terrakion and susceptible to coverage moves on the Pokemon it is supposed to check like Fire Blast on Mega Altaria. This is further compounded by Ferroseed's lacking damage output, making it vulnerable to common Taunt users such as Hydreigon and Krookodile and common setup users like Cobalion. Ferroseed also faces competition from other defensive Grass-types like Amoonguss and Chesnaught, as they have more reliable forms of recovery and check more threats. Roserade and Chesnaught in particular can set Spikes like Ferroseed. Finally, Ferroseed's lack of reliable recovery outside of Leech Seed often leaves it easily worn down, hampering its ability to check the threats it's supposed to check, especially if there is an opposing Grass-type to potentially absorb Leech Seed.