>>36566465I mean, that is totally possible. Vaporeon can dissolve and reform itself in water whenever it wants, as stated by multiple Pokédex entries.
If I recall correctly, there was an entire thread dedicated to figuring out what would happen if you dissolved a Vaporeon in a bathtub, had someone get in the bathtub, then had the Vaporeon reform itself while the person was still in the bathtub. The conclusion was that if the Vaporeon reformed, the human was stuck inside the Vaporeon until it dissolved again.