This is... almost there
First sent is a counter to the player's starter
Next three are the dark/psychic/fighting triangle, in an order where each counters the previous 'mons weakness
Eelektross meant to be the final team member since it forces you to win without a type advantage (or with a type advantage if you have a levitate counter)
This leaves room for one more pokemon, I'd want it to be a mixed attacker that doesn't overlap one of the types this already has. At this point I can't be fucked to weed one out, but it'd be the second one sent out
Anyway here's my music:
https://www.youtube.com/watch?v=jv1yYDzvFtQalso just realized this is only using gens 5 and 7, lol