There isn't really a certain time of day. But you should check every 4 to 6 hours.
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If you look every day, the cave will sometimes dry up and there will be these odd white piles of something on the floor (lol...) - this is shoal salt.
spheal is in shoal cave, which is above mossdeep city. the cave can either be flooded or dry depending on the time of day. i think all you need is surf. hope this helps!
There is a system of tides in shoal cave. Every six hours, the tides change form high to low. Only in low tide can you access the lower rooms. If you are playing on a VBA, I suggest that you activate the Real Time Clock function in the Options menu.
unfortunately you have to fix your game internal battery . just check how on YOUTUBE.
You can't drain the water, but you'll have to wait for its tide. On high tide, the water floods the cave. For low tide, the cave is dry. It all depends on luck whether its high or low tide