No.
The land, Pokemon, and dungeons are extremely different.
Arceus and Shaymin are the only two Pokemon of the series not to feature in Pokemon mystery Dungeon 2
No,arcus is not in mystery dungeon 1 or 2
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Answer:Yes
there is no shaymin (or arceus) in mystery dungeon 2. in Pokemon mystery dungeon explorers of the sky (check out serebii.net for that), there is shaymin and arceus, but i don't know if shaymin is recruitable.
arceus isn't in Pokemon mystery dungeon 2. he is maybe in Pokemon mystery dungeon 3.
sorry lucario cannot be found in Pokemon mystery dungeon blue rescue team nether in red rescue team.all that i know that you can find lucario in Pokemon mystery dungeon 2 in lost wildrdness (im not sure that i spelled it right)
Pokemon Mystery Dungeon 1: Red Rescue Team/ Blue Rescue Team Pokemon Mystery Dungeon 2: Explorers of Time/ Explorers of Darkness
If you're talking about Pokemon Mystery Dungeon Explorers of Time or Pokemon Mystery Dungeon Explorers of Darkness, you can recruit as many Pokemon as you want. If you are talking about Pokemon Mysatery Dungeon Blue Rescue Team or Pokemon Mystery Dungeon Red Rescue Team, you can only recruit a certain number of Pokemon per friend area.