wants to tell you...
Air Lock still Nullify Primordial Sea and Desolate Land.
Self tested, weather graphic still exists, however effects are gone.
Tested with Solar Beam and Desolate Land ability.
My party: Charizard Y with Solar Beam, Primal Groudon with Desolate Land
Opposing party: non Mega Rayquaza
If a Rayquaza is on the field with Air Lock regardless if Groudon activates Desolate Land first or after Air Lock, Solar Beam will require 2 turns to fire off instead of 1 when the weather is Sunny or Heavy Sunny.
In which this tells me the weather effects are Nullified.
Also, does not matter if Groudon or Kyogre is slower, because Primal always activates first hand when entering field.
While you choose when to activate Rayquaza's Mega, and thus activate Delta Stream after Groudon or Kyogre.