-Similarly, I'm afraid that sand, when it's in the form of a tall structure, such as a pillar or a sand castle, cannot withstand being damaged by a strong attack like Iron Tail. Also, when I ref Earthquake in a sand-filled arena, even if it had hit Cotton Candy, the sand would have absorbed some of it, weakening the Earthquake a little, sorry to have to tell you these bits of information Dogfish44, but common sense is something you don't want to overlook too much.
The latter i assumed, but the main use of earthquake was to crush with the pillar.
The bolded bit however is what puts me off, as i would assume under the sand was soil, as is in most places, thus creating the tower in my head. [/rant]

Also, I assumed that magnet rise was timed from the start of the floating. ;_;

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Anyway, let me see how this goes.
Gible, you live in a sandstorm for crying out land. Deal with it.
Use Sand Tomb if it isn't going to Magnet Rise, or use Mud Shot if it does.
Follow up by using Dragon Breath.
Wait until the end of the round now, and bring back the sandstorm. If it is gonna try the same thing, waiting for you to go first, blast it with a mud shot instead.

Sand Tomb / Mud Shot ~ Dragon Breath ~ Sandstorm after Cotten / Mud Shot