First of all its Rayquaza and on sky tower theres 25 floors than a floor to save your progress then theres 9 floors after that so thats a total of 34 floors good luck

use a wrap scarf to get to Rayguaza,use a feraligatr(evlvoe todile to crosdow then to
feraligatr,then teach it ice bean)then keep using ice beamto kill him,he might join u.