>>55993728I've always been a big fan of giving the form changes Rotom style buffs. Give each form specific stat changes to match a play style and then really beef up its move pool. I'd also have the Forecast ability proc when it's holding a weather rock, which then gives Castform a cool gimmick of being the one mon that can auto set up any weather. I'd also make Fog a legitimate weather condition, maybe with some tweaks to make it more competitive, and then do something with that -- as well as with giving it a Sandstorm form, even if it doesn't totally make sense. I don't know about letting it change form on terrains though because that's not really its thing, but it is bizarre that it doesn't really get any terrain moves or anything that deals with them, especially Misty and Electric Terrain, which are the most "weather" like. I was really surprised to learn this little guy doesn't get some of the more obvious shit like Mist or that the moves Tailwind and Defog were removed from its learnset in BDSP