Global Swarming

The 4 new Pet Battles on Forbidden Reach do not require level 25 pets for the ach., just to kill all 4. You can easily and quickly defeat them with level 1 pets without killing the additional pets to weaken them.

One daily pet battle world quest will be up each day on the Forbidden Reach and rotates between these 4.

Each is on their own little island off the coast of the mainland of the Forbidden Reach, and each pet is accompanied by 7 nearby pets which can be engaged separately. The main "boss" for the World Quests and the achievement have a buff called Legendary Intensity which suggests that you should defeat the nearby battle pets to weaken the boss. I had mostly Level 1 pets on PTR and I found they were able to beat the bosses without the need to beat the nearby pets so I never bothered, but took a crack at one of the pets just to see how it was and found it to be easy as well, so either way would probably work but maybe the bosses are more challenging when scaled up to Level 25.

Vortex is surrounded by 7 Storm-Touched Swoglet.
Tremblor is surrounded by 7 Storm-Touched Slyvern.
Wildfire is surrounded by 7 Storm-Touched Skitterer.
Flow is surrounded by 7 Storm-Touched Ohuna.

Also the bosses are not present on days when their World Quests are not up, so you can't do it all in one day. The boss and nearby pets also despawn when you complete the World Quest, so if you're trying out different comps and such, make sure not to actually finish the boss off.

/way #2151 18.25 13.35 Vortex
/way #2151 67.30 12.26 Tremblor
/way #2151 13.15 53.61 Wildfire
/way #2151 89.29 60.39 Flow

When arriving on the zone, the elementals have Legendary strength. Around the bosses are side bosses (normal pets empowered by storms). Each of the side pet you kill will lower the boss power by one : epic after killing one, rare after killing two. Attaining uncommon status by killing a third side pet does not seem to work, because the boss get back his lost status !

For example i killed the first side pet, boss went epic, another one, boss went rare, another one, boss went back to epic instead of uncommon. Don't know if it's intended or not.

WARNING : If you want to get the pet associated with the boss (there are 4 in total for the 4 bosses) you HAVE to beat the boss in rare form, so you HAVE to defeat 2 side pets beforehand !