Gabby was researching more ways with portal technology. which eventually led to her discovering the Rogue Glorb, an interdimensional being that has quite the playful attitude.
The dino girl was able to communicate with the entity and both agreed on tickle testing, which brought Toonverse Gumball and Nicole in the picture.

GB and Nicole belong to Ben Bocquelet
Toonverse GB and Nicole + art belong to  frozarcold