You can get Lotad, Lombre, Sableye, Seviper and Lunatone.
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Have ruby or emerald or another sapphire trade you a Pokemon holding the sun stone they received or get one from firered or leafgreen.
The Poke virus on Pokemon diamond and pearl actually gives non-traded Pokemon a extra exp boost although it doesnt say it. it is very rare though.
Apart form the Battle Island no there is no second map or extra islands.
You can't. In every Pokemon game that i know of, the limit is always 6 and you would need to change the game coding for a different amount.
Manaphy is not originally in Pokemon Diamond. In order to obtain it (without an action replay) you must play all the way through the game Pokemon Ranger. In the last (extra) mission of the game you can acquire the manaphy egg and then send it over to Pokemon diamond.
No, a SD card is not required to play Pokemon Alpha Sapphire. However, it is strongly recommended as extra content will require the use of an SD card
on this page: http://www.filb.de/games/tools/aikotoba
Shedinja is the leftover Pokémon when Nincada evolves into Ninjask at level 20, if you have an extra slot in your party.
you go to the abandoned ship and you need a Pokemon that knows diveI can type in large bold print too!you can get extra luxury balls by winning a master rank contest after your Pokemon already has the ribbon.
You can catch Ralts south of petalburg city. Ralts is a great Pokemon trust me and if you have diamond/pearl get an extra male ralts and evolve it into kirlia. Give the male kirlia to your diamond/pearl and use a dawn stone on it and it will evolve into Gallade
No, but you can trade Manaphy if you complete the special 'Manaphy Egg' extra mission. Otherwise, no other Pokemon can be traded over from Ranger.