Marcus' Serperior

Marcus's Serperior is the starter Pokemon that is owned by Marcus.

As a Servine
Serperior first appeared as a Servine in The Ambitious Marcus Arrives! where it is seen battling against Nate's Tepig, but KO'd itself due to its trainer's clumsiness of attacks. It later reappears to battle Tepig again, but is easily defeated due to a type-disadvantage.

As Serperior
In BF026, it was revealed to have evolved into Serperior before the start of the Battle Storm tournament which is revealed to Nate and the others. However, it was never used in the battles because its trainer lost.