I would prefer
Snivy beat one Emolga
Roggenrola/Tranquill/Palpitoad beat the other
Roggenrola/Palpitoad beat Zebstrika
It would be cool to see a sweep, we haven't had one in a while.
Not sure if anyone would like it but Elesa could be like Crasher Wake except for a slight difference. So let's assume for a moment that Ash chooses Snivy, Roggenrola, and
SwadPalpitoad, and Elesa has Zebstrika, Emolga (Male), and Tynamo/Eelektrik.
Roggenrola vs Emolga- Roggenrola got the advantage but Emolga volt switches. And Elesa sends out Tynamo/Eelektrik
Roggenrola vs Eelektrik- Roggenrola isn't doing so well since Eelektrik uses flash cannon. Ash is forced to change up and recalls Roggenrola and sends out Snivy.
Snivy vs Eelektrik- Snivy makes quick work of Eelektrik. Elesa sends out Emolga.
Snivy vs Emolga- Because Elesa wasn't expecting Snivy to lay attract on her Emolga, Snivy makes quick work of Emolga first. Then Elesa sends out Zebstrika.
Snivy vs Zebstrika- Thinking he had this in the bag, Ash makes a mistake and Snivy suffers for it because of flame charge and is knocked out. Wanting someone fresh, he sends out Palpitoad.
Palpitoad vs Zebstrika- Pretty much tipped in the balance towards Palpitoad, since Zebstrika can't learn anything effective to combat Palpitoad but it comes to a struggle with Palpitoad barely managing to win.
Remember this is just an example, Palpitoad could've easily been replaced with Roggenrola when things got too tough, and Roggenrola could've made the victory. Or it was Roggenrola who got 2, Snivy 1, and Palpitoad zero.
In this instance nothing has to be the fall guy, and still some Pokemon got two wins while another one got the final win.