RE: Does Reshiboar need a tech against Blastoise?
Reshiboar does not really need to tech against Blastoise, unless you consider PlusPower optional. Blue Flare with a PlusPower destroys Blastoise (+2 would kill Gater), and after a couple of those they might not be able to make a comeback, especially if you get the Gater up with Catcher. As for the variants that run Floatzel they might give Reshiboar more trouble - Floatzel is a lot easier to set up than a Gater and it can actually retreat.
You could add a Zekrom or two, but that isn't really teching against Blastoise - that's just giving your deck a different avenue of attack.
And all this is coming from someone who plays Blastoise.