There is a region somewhere between kanto and sinnoh, where a ultra wormholes has opened, merging ultra space with the hazama region’s environment. Which leaded to some pokemon drastically changing their appearence. (Hazama region)

Hazamean victreebel line has changed to survive in the ultra jungle biome, making it more bulky.

Same to the hazamean ambipom line.

Wigglytuff line and sableye has changed to survive in the ultra sulfur swamps biome.

Because of consuming sulfur sableye has became very explosive.