This looks interesting. Due to Palossand being a ghost type, CH can't harm him by normal ways. Even if he/she manages to do some damage, the sand castle can heal itself by using Shore Up or by targeting CH with Giga Drain or any absorbing attack. Also, the pokemon can put CH to sleep or possess him/her, but IDK how this ability works.
The location might be an advantage or disadvantage depending of the circumstances. Palossand can't go to the ocean and CH can go to the water, stay there and use the water to harm it. For example, CH can flood the entire beach with his/her AP, but if the pokemon survives its ability will trigger and its defense will raise.
Well, tbf, by common sense a sand castle is weak against a large amount of water, so it is kinda obvious that Palossand has this kind of weakness. But yes, it might be necessary for CH to have some knowlegde.
Its intangible against karate and punches, sure, but couldn't he just use a hose? If his guns scale to his AP then I think a hose would too.
Granted, Palossand can restrict his sight with Sandstorm and Sand Attack, restrict his movement with Sand Tomb (if i remember that one PMD short right thats how those moves work), drain his life with Giga Drain, put him to sleep/hypnotise him with Hypnosis, is resistant to most of his weapons outside of the hose, and outright heal with Shore Up. Palossand probably has this.
@Nico Excuse me, but a legit simple Fire Hydrant isn't going to hurt Palossand at all. This is a TOWN LEVEL sand castle we are talking about here. Unless CH can build a superweapon that uses water, this argument isn't valid.