Everything kinda supports eachother (exept heatran and the rayquaza's)
Bolthund V, Arceus and Pikachu Zekrom all feed Rayquaza with energy while Eelektrik and Fisherman take energy from the discard pile. Once youv'e charged up the Rayquaza, you can take a V, GX or TagTeam from the discard pile with Echoing horn, use bosses orders to bring it out and win? If the strat doesn't work as intended, just freestyle it.
Thats the main gyst of it...