User blog comment:BannedLagiacrus/Monster Appreciation Week: Lavasioth (4th Gen)/@comment-6050823-20161216021637/@comment-27125903-20161216162732

They simply wanted to complete the trio... Imagine Arzuros and Volvidon without Lagombi?

A trio has to have all 3 to stay consistent.

And even if Plesioth sucks and Cephadrome is kinda forgettable, they wanted the piscines back, I wanted the piscines back, therefore, they should bring all 3.