Warvee

Warvee is a Water-type Pokémon Fusion. It is a fusion of Wartortle and Eevee.

It evolves into Blastoreon at Level 36.

Warvee can be obtained if the player chose Squirtle as a starter by evolving it and then fusing Wartortle with Bill's Eevee upon meeting him at Sea Cottage. It also has been known to create havoc with its bushy tail

Rival's Warvee
If the player's Rival, Brendan or May, chooses Squirtle as his or her starter, he or she will fuse it into Warvee, presumably with Bill's help. He/she will first use it when encountered on Route 6. When encountered in Pallet Town, it's evolved into Blastoreon.

Other Warvee
A Team Aqua grunt under Lavender Town will use a Warvee they created with the stolen fusion machine (or possibly with the duplicate).

A trader named Reva in Ecruteak City will trade the player a Warvee in exchange for a Feraligatr if the player does not own one already.

Pokédex Entry
"The dense for this pokemon has poison on its hole body,,.

Locations

 * Sea Cottage (Fuse Wartortle with Eevee)
 * Ecruteak City (Trade for Feraligatr)

Trivia

 * Warvee was created in 2005 and its sprite was updated to the current one shortly before the release of Pokémon Fusion Generation in 2012.
 * Being an Eevee Fusion, it's one of only five Pokémon Fusions that can evolve in Pokémon Fusion Generation, the others being Eeveesaur, Charvee, Pikavee, and Growlvee.