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Evo idea. There's a type of aquatic snail that lives near volcanic vents, and has a shell and scales made of iron.
>fire/steel
>based on those snails, and also meant to evoke a metal foundry
>basically becomes a poor man's heatran, but with recover and some other fun toys to differentiate it
Also gimmicky but
>magma armor now sharply raises defense if hit by a water or ice type move (because some of the magma cools and hardens, becoming rock armor)