Speaking of profound mana and exquisite Daoist Skills, Shao Yuanjie surpassed the four Flood Dragon Kings, but in terms of controlling the weather, aside from the legendary Master of Rain, Chisongzi, no one could rival the Dragon Clan.
In "Journey to the West," Fengxian County hadn't received rain for three years, causing such drought that it took lives, with two-thirds of the people dying. Selling children and daughters became common, resembling Hell on Earth. Even though the Seventy-two Earthly Fiend Technique clearly had a "Praying for Rain" spell, Sun Wukong still went to seek the Flood Dragon King for rain.
It wasn't that Sun Wukong couldn't do it; it was that the Jade Emperor wouldn't allow it. If the Jade Emperor forbade it, even the strongest Rain Seeking Technique couldn't make a single drop of rain fall from the sky under the suppression of the Flood Dragon King.