Quoted By:
Villain would be a crazed shaman or something like that who wants to merge the living world with the spirit one,for some reason.
Team is:
Dusknoir-Obvious choice,he can go back and forth from a world to the other
Lucario-Bodyguard of the team,both for its power and ability to perceive aura
Xatu-Can see into both future and past(useful to locate people and pokemons in the past and better plan his path).Also would be helpful for rituals,i guess
Oranguru-Smart,experts of herbs and such,main use for rituals of any kind
Gardevoir-Although this is more of a typing choice,she can see into future,defy gravity,capable of telephatic powers and can protect trainers very well through black holes
As for the 6th slot it could be Gengar(Mega can go through dimensions,Gigamax is possibly a door to the afterlife),Cofagrigus(it can trap the summoned spirits and pokemons),Claydol(apparently it has connections to outer space creatures,also a doll for voodoo),but given the team already has 3 weaknesses to ghost and dark i would like to have some type variation,like maybe ninetales