Use a move like sunny day, or use Groudon (for drought) to make it sunny. Then Cherrim will transform.
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evolve a shiny cherubi and there you have it. Also, if you don't have a shiny cherubi, evolve cherubi and teach it sunny day (you can) and use it every time you battle.
No. You can't change languages. Even in SoulSilver.
You can't, as with all traded Pokemon, you can't change their name.
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When you change your DS's time Soulsilver/Heartgold automatically changes to the DS's time setting. You can check the Pokegear's clock.