A proposed evolution for Glocto was based on a kraken/giant octopus, but it lost to Lavoon's blue whale design.
It was suggested that Lavoon be able to evolve through exposure to either a Water Stone or Fire Stone (similar to Scovalope and Bullotus), but in the end it was decided that it should evolve via leveling up.
A further suggestion was that it should only evolve via leveling up while surfing, which this was also eventually rejected.
Lavoon is based on a blue whale. It also continues its previous form's lava lamp theme.
Lavoon's name is a combination of lava and the onomatopoeia ooon (the sound made by whales). It may also contain the words monsoon, lagoon, or typhoon.