Reworded as of March 20 09:
To evolve your starters. First you have to make sure you have beaten the entire game. AKA, you must defeat Darkrai since he is the final boss. After that, you will start off again at your team base as the cliff, with Cresselia up the stairs looking out to the ocean. Talk to her, and she will offer to join your team, say "yes" of course. Then head on over to Spacial Rift where Palkia is. Yes, you have to go through many floors again so bring some helpful items with you. Once you reach Palkia, you have to defeat him again. After you defeated him, it will also offer to join your team. Don't worry, Palkia joining your team is a absolute 100% when you beat him. As what I'm saying, allow Palkia to be on your team.
Now, all you need is Manaphy to come back to you. For this to happen, you have to do three days of random pokemon missions, (I don't think Sentry Duty will work) for Manaphy to come back. The event will activate when Chatot runs to you at the cliff telling you that Manaphy as returned. I advise you to get tissues because I cried when Manaphy came back. Manaphy will then offer to be on your team. You better say "Yes."
There you go! You have access to evolve, so head on over to the spring!
You don't need Dialga to evolve.
This video is to Infereast345 (a great friend), on the True way to evolve
btw, my sentry duty records are in the end of this video, I do not care if you beat me, I already beat my own record
Edit June 24 2008: People are saying like "How do you evolve Munchlax" Well to evolve Munchlax, You need to raise its IQ to 2 Full Stars, So eat those gummis
Edit June 25 2008: Now people are saying "How to evolve Riolu to Lucario" Well to evovle riolu, you must have a item called the "sun ribbon" and have its IQ to 1 full star or 1 1/2 stars
Edit June 28 2008: Now people are saying they followed everything in the decription or video and still CAN'T evolve, Maybe you need to raise its IQ higher, I don't know anything else, If you found a different way to evolve, then mail me
If you request to see my evolved Treecko (Grovyle) to beat up Dialga in evolved form, click here.
http://www.youtube.com/watch?v=8dMxlfa5-O0
Edit July 7 2008: there are plenty of questions involving something that is off topic like "How do you recruit Darkai" or "How do I beat (Insert pokemon name or dungeon here)" I won't even bothering answering those, go to gamefaqs.com or gamespot.com for those questions
Edit July 10 2008: It does NOT matter what nature you are like (Quiet, brave, hardy, etc)
Edit August 4 2008:
People are saying how to evolve Pikachu, You need a item called the "Thunderstone" to evolve, I don't know where to get one of those, try going to the shop everyday or something
Edit September 7 2008: THIS IS NOT A PLACE FOR SOS MAILS AND EVOLVING POKEMON THAT ARE NOT YOUR STARTERS!
Edit February 22 2009: If you people still don't get it, just don't make a stupid comment saying "THIS IS WRONG" or "I DON'T GET IT!" Either read the description CAREFULLY! Or get help from google. I don't have time for all these complains.
Edit March 7th 2010: I don't know if this is true but, Sky doesn't require Palkia to be recruited. So to sum it up, for you playing Sky, beat Darkrai and get Manaphy on your team.
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im a pikachu how do i evolve
AirforceHero001 23 hours ago
I'm an Eevee! How do I evolve?
HappyMoodGirls 1 day ago
@FawnOnyx you *MUST* have palkia in your party, thats how im a typholsion now
iiSyoaran 3 days ago
I got manaphy but can't envolve
FawnOnyx 1 week ago
Thanks
FawnOnyx 1 week ago
You are WAY better than me.
epicshadowlugia 2 weeks ago
thanks it helped but i'm still at the part when i went to the future! :P
GuyaneseBoi27 3 weeks ago
@2shinx you can't bring any teams mates with you besides your main partner and cresselia
Ocarina2020 4 weeks ago