Originally Posted by Fat Komodo
You should mention Pokemon that can switch into Wartortle's weaknesses, such as Ferroseed. Furthermore, Wish support should be mentioned, and possibly something about Dark-types that can remove Ghost-types that block Rapid Spin. There's no point in listing the ability, just mention them both in Additional Comments. Hidden Power Grass should be mentioned somewhere to hit opposing Water-types. Additional comments should suffice. In my opinion, Yawn should definitely get a slash with Ice Beam. If the opponent switches in a counter, they have a choice of KOing you and falling asleep, or switching out. It works great with Stealth Rock and Spikes support. I could probably mention more, but this is all I can see off the top of my head.
Just with dark types, they are unnecessary because wartortle carries foresight.
Everything else will take some time but I will add.