Wyvern Hill.
Darkri
49f liar
Fight Darkrai
its marine resort
wyvern hill
I think its either Dusknor or Darkrai OR Palkia...OR OR Dialga...Its most likely Dusknor or Darkrai though.its darkrai of course
he is on the 40th floor I'm pretty shore that there is a trap on the 20th floor that takes you to the last floor
The last Pokemon you fight is arceus in destiny tower. Destiny tower has 99 flors so it is hard. also you have to entr at lvl 1
The same way you do in Pokemon explorers of time. You have to go to some mission in the spacial rifts then you have to be the person to hit him last, if your partner hits him. It will just say you defeated Palkia, oh and I don't remember how to get the mission on the spacial rift, nor do I know how to get the dungeon. Well, hope I helped. :)
sometimes, when you go to the rescue board (not the outlaw board), there is a post that says to explore a new place. other than that, I think it is the Marine Resort Manaphy finds.
You keep doing jobs until Manaphy wants to join your team. Eventually He will tell you about Marine Resort. That is the last signifigant thing that happens in the story.
The serious last time you beat Giovanni is at the viridian city Pokemon gym.