I was just going to say this. Hoenn had too many good Normal-types with better niches. Just from the top of my head, there's Slaking (aka, ultimate revenge killer), Zangoose, the Toxic Boost-wrecker, and Linoone, which is a great Pick-Up-Slave (and lol, B-Drum sweeper or ResTalk+QuickFeet), Spinda has 10BST in each stat, but in general gets more usage due to better support moves and sheer annoyance, and Delcatty can become pretty buff with enough Cosmic Power-boosts and then could give you hell if you use the Normalize-spreading-strategy.. and then there's Protean Kecleon, which is easy-use honestly.
And it didn't get any better for Castform with the Weather-nerf. The only thing it's got is Weatherball and recently Hurricane, which means that the only viable set has become: Weatherball/Hydro Pump, Thunder, Hurricane, Rain Dance.. Which makes it quite predictable in my eyes.
What should happen though, is that it gets a Mega Evolution, and focuses everything on special attack and speed. Now, you could wonder, how would that work? In my eyes, it should ditch Forecast after the Mega Evolution, and give it Adaptability, to crank up stuff like Weatherball even further. So basically, the use would turn into this:
- Castform switches form before Mega Evolving.
- The Mega Evolution form is based on the form it had when Mega Evolving. After which there's no switching back. So a Rainy Castform can evolve into Rainy Mega Castform, but can't change to Sunny Mega Castform after it has Mega Evolved. That's the only way Castform could get a Mega Evolution, with a different ability then Forecast after Mega Evolving.
That would make Castform a bit more usable.
Carracosta, with the good moves and set up it can be a big threat to a lot of people. I use it common and it is a great counter for a lot of pokemon (talonflame and Mega charizard Y) just abuse his shell and his sturdy and most of the time you are fine.
CostaSmash is actually pretty common online to my knowledge.. Two great STABs and the initially low speed allows it to tank a hit before smashing and sweeping afterwards.