It doesn't necessarily join on the first time. On my explorers of time he it didn't but on my explorers of sky it did. It's all to do with Giratina's recruit rate (about 8.6%)
Giratina is found in the final dungeon of Pokemon Mystery Dungeon: Explorers of Darkness, named Spacial Rift. It is recommended to be well-prepared with strong Pokemon and items before attempting to face Giratina.
In Pokémon Mystery Dungeon: Explorers of Darkness, Giratina cannot be recruited as a team member like other Pokémon. However, you can battle Giratina in the Aegis Cave after obtaining the Secret Slab and Mystery Part, and then “following” it for a chance to battle and potentially recruit it. Remember, catching Giratina can be quite challenging, so be prepared for a tough fight!
In Pokemon Mystery Dungeon: Explorers of Darkness, you can recruit Giratina by completing special missions in the game that involve encountering and defeating Giratina in its dungeon. Once you defeat Giratina, you will have the opportunity to recruit it as a team member and add it to your ranks.
Groudon, Kyogre, Rayquaza, Mew, Articuno, Heatran, and Giratina.
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possibly anyone you see in mystery dungeon are possible to get
Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness will be released in Europe on the 4th of July, 2008.
The Great Hole but you need a wonder-mail code and the code is: wnwy jxtk &5c1 4n3- p4nm 8k&c.
They don't have it in Explorers of Darkness, only in Explorers of Sky
You Can't
its marine resort
The Temporal Tower has 23 floors in "Pokémon Mystery Dungeon Explorers of Darkness."