Ferroseed
The Thorn Seed Pokémon
Type: Grass/Steel
Official Registration #: 597
Entry: A seed-like pokémon native to Unovan caves. Using its sharp thorns, ferroseed anchors itself to the iron-rich walls of its subterranean habitat. However, when it senses danger, it fires its thorns in all directions, which enable it to roll away quickly. Given the fact that it possesses a thick iron hide and the fact that it dwells primarily in cold caves, far from the natural habitats of any Unovan fire-type, it may be difficult to grasp what might prey on the ferroseed, but in truth, the answer is the human. Not only are the soft innards of a ferroseed a delicacy (noted for its strong, cheese-and-onion taste, as well as their slight hallucinogenic properties), but also, only a human being would be masochistic enough to figure this out.
Ferrothorn
The Thorn Pod Pokémon
Type: Grass/Steel
Official Registration #: 598
Entry: The evolved form of ferroseed, by battle experience. A ferroseed’s hide thickens upon evolution, which causes it to lose its ability to move quickly across a cave floor but gain the ability to withstand harsher attacks. As such, it has become a highly sought-after pokémon to many trainers, as it can root itself in the middle of the battlefield and unleash a combination of Spikes, Leech Seed, and Toxic before suffering the consequences of one too many Flamethrowers. Of course, despite its advantages on the battlefield, there are many disadvantages to training a ferrothorn, namely the fact that not all battlefields are flat surfaces—which, incidentally, should be taken as a note of caution to anyone who thinks bringing an immobile, 240-pound grass-type to the Cerulean Gym is a fantastic idea.
The Pokédex According to Bill 