Koalpuff - I kinda love this thing, it has crazy Speed, SpD, Octolock, and Neutralizing Gas. It's also got Knock Off and Will-o-Wisp for support. The downsides are the poop Def and offenses (that said, I think it's great that this thing has Thrash and Raging Fury, even if only for flavor). It doesn't have Taunt, which means it's probably not overbearing or even all that good. Seems interesting, though.
Spidmaton - 160 Atk and 150 Spe is pretty extreme, but its STAB moves, Iron Head and Poison Jab, aren't that scary. What's scarier is its coverage in Spectral Thief and Bitter Blade. Outside of that, it has Volt Switch and Bullet Punch, meaning it's pretty much going to be an offensive pivot, and likely a Choice Band user. I think it seems fine? Doesn't excite me though.
Eleitan - Pretty cool bulky attacker, but unfortunately pretty much all it has is attacking moves. Hiding in the unviable moves section are Rising Voltage and Muddy Water, which could certainly prove useful. It also has Salt Cure and Aromatherapy. Could be a decent Special tank, or it could fall flat, but it seems pretty cool to me.
Chilltile - It's like some kind of bizarre special Ice-type Melmetal. The bottom tier Def really murders this things dreams imo - together with the Ice type, the opportunities for this thing to fire off strong attacks will be limited. It might be strong against passive teams, and played well can probably take some epic special attacks, but it feels really hard to make work.
Metathorn - Well, it has 13 Atk, 54 SpA, and tons of attacking moves. Time to Anchor Shot, Yawn, Silk Trap, and then BODY PRESS to victory. Surely no Ghost types would switch into another Ghost type!