The legendary pokemon alone could demolitish the digimon world palkia would only have to open a spacial rift to the digiverse and then dialga goes and stops time. After this all thats needed to be done is the rest of the legendary pokemon come through and use there unique abilities to destroy all in there way. Xerneas alone could make the legendary pokemon immortal while yveltal absorbs the life out of the people and digimon in this universe. Giratina can come in droping anti-matter bombs everywhere to do a ton of dammage. Uxie mespirit and azelf could take the conscience out of the people on this world to have them fall to there knees as a vegetable. Reshiram zekram and kyurem could then do a little fusion combo action as either white or black kyurem he will always have the one hes not fused to fighting along beside him. The weather trio could make rain and drought on each half of the world. Rayquaza would allow meteors to hit the planet. And arceus would be the one calling the meteors.