Snover can eliminated with a Croagunk, thanks to its STAB priority move in Vacuum Wave, while being able to break a potential Substitute with Fake Out.
I would never switch in Croagunk against Snover, who has a powerful STAB Blizzard which, if I remember correctly, OHKOes Croagunk. You should probably mention a more surefire counter/check, like Houndour. It can either hit it with Pursuit as it switches out for heavy damage, or scorch it to death with Fire Blast if it tries to stay in.
Snover can also completely ruin Phanpy's strategy by inducing Hail, which will finish off Phanpy when the turn ends.
That's a really small mention of Snover in the Counters section. It doesn't only ruin Phanpy by inducing an everlasting hailstorm, but its capable of threatening Phanpy in general. In the lead position, Phanpy is immediately threatened by Snover's Blizzard, so you should let the reader know about this., rather than saying it can set up a hailstorm which Phanpy hates.
You should also mention why Bronzor is not a solid counter to Cranidos, because I completely forgot about Mold Breaker, heh.