QwIlfish 2: The Squeakquel
Evolves when traded while holding a Metal Coat, turns into a big metal naval mine lookin' thing. The Pokedex talks about its toxins being highly volatile.
Water/Steel
Abilities: Flame Body/Iron Barbs HA: Intimidate
HP: 65-->90
ATK: 95-->125
DEF: 85-->100
SPA: 55-->60
SPD: 55-->80
SPE: 85-->70
BST: 440-->520
Learns Recover, Magnet Bomb, Iron Head, Spiky Shield, Gyro Ball via TM, Flame Wheel, Self-Destruct, Explosion, Double Edge, Flame Wheel, Flare Blitz, Flame Charge via TM.
Flare Blitz might be too much, but I didn't want to steal Heat Crash or Fire Lash in addition to Spiky Shield. Though Heavy Slam and Heat Crash on a particularly heavy minefish crossed my mind. Ideally, instead of Flare Blitz, it'd get a signature move that was just a 75 BP 95 Acc Fire Type move that had a chance to poison.