I think the pokemon who really could use it are dialga, and to a lesser extent, palkia.
Dialga wont get hurt by a partners lava plume, or earthquake which is really good. It might even work well with doryuuzu.
Palkia doesnt need it to much. Surf is doubly resisted, but hp is hp. Like zapdos, it gets a way of taking discharge.
Giratina thinks it got powned.
Zapdos got scammed from heatwave. Anyone wish some ghosts got levitate (chandera, froslass...)
Also how cool would it have been for the legend birds to get
Articuno (Snowarning) take that abomasnow, you stupid fire hazard. Would have been a better lead, less weakneses.
Zapdos (drizzle) it does seem to always be near thunderstorms and 100% Thunder is nice
Moltres (drought) Powering up its fire moves. Just seems right for a firebird.
But thats just what i wanted.